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Chandra KK, Malhotra C, Jain AK, Sachdeva K, Singh S. EFFECT OF DECENTRATION ON THE QUALITY OF VISION: A COMPARISON BETWEEN ASPHERIC BALANCE CURVE DESIGN AND POSTERIOR ASPHERIC DESIGN INTRAOCULAR LENSES. J Cataract Refract Surg 2021; 48:576-583. [PMID: 34486577 DOI: 10.1097/j.jcrs.0000000000000810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 08/24/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE To study the effect of decentration on the quality of vision in two aspheric intraocular lenses (IOLs): aspheric balance curve(ABC) design Vivinex iSert XY1(Hoya Surgical Opticals, Inc.) and posterior aspheric design AcrySof IQ SN60WF (Alcon Laboratories, Inc.). SETTING Advanced Eye Centre, PGIMER, Chandigarh, India. DESIGN Randomised Prospective Trial using Random number table. METHODS Eighty-five eyes were randomized to Group 1 (Vivinex XY1) and Group 2 (Acrysof IQ) with 40 and 45 eyes respectively. The HOA profile, Strehl's ratio, decentration of IOL from the visual axis (DVA) and the geometric axis (DGA), angle Alpha and Kappa were recorded on the iTrace aberrometer and contrast sensitivity was measured using the Functional Acuity Contrast Test at 12 weeks post-surgery. RESULTS The mean values of the Strehl's ratio (p=0.48) and the HOA's (p=0.12) of both IOLs were comparable. The HOA's gradually increased with increasing DVA for both lenses at 3, 4 and 5mm pupil sizes. On comparing the HOA's with the DGA a statistically insignificant positive correlation was observed. The Strehl's ratio did not deteriorate with increasing angle alpha in the Vivinex XY1 group, however worsened in the Acrysof IQ group. The contrast sensitivity was comparable in both the IOLs except at 1.5cpd under photopic conditions where Acrysof IQ was better. CONCLUSIONS Decentration of the lens is best measured with respect to the visual axis. In eyes with a large alpha, the ABC design induced lesser HOA's and maintained a better Strehl's ratio.
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Hui PC, Pereira LA, Dore R, Chen S, Taniguchi E, Chodosh J, Dohlman CH, Paschalis EI. Intrinsic Optical Properties of Boston Keratoprosthesis. Transl Vis Sci Technol 2020; 9:10. [PMID: 33200051 PMCID: PMC7645245 DOI: 10.1167/tvst.9.12.10] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 09/07/2020] [Indexed: 12/03/2022] Open
Abstract
Purpose To benchmark the optical performance of Boston Keratoprosthesis (B-KPro). Methods Back focal lengths (BFL) of B-KPros for various eye axial lengths were measured using an optical bench, International Organization for Standardization–certified for intraocular lens characterization, and compared against manufacturer's specification. The modulation transfer function (MTF) and the resolution efficiencies were measured. The theoretical geometry-dependent higher-order aberrations (HOA) were calculated. The devices were characterized with optical profilometry for estimating the surface scattering. Aberration correction and subsequent image quality improvement were simulated in CODE-V. Natural scene-imaging was performed in a mock ocular environment. Retrospective analysis of 15 B-KPro recipient eyes were presented to evaluate the possibility of achieving 20/20 best-corrected visual acuity (BCVA). Results BFL measurements were in excellent agreement with the manufacturer-reported values (r = 0.999). The MTF specification exceeded what is required for achieving 20/20 visual acuity. Astigmatism and field curvature, correctable in simulations, were the primary aberrations limiting imaging performance. Profilometry of the anterior surface revealed nanoscale roughness (root-mean-square amplitude, 30–50 nm), contributing negligibly to optical scattering. Images of natural scenes obtained with a simulated B-KPro eye demonstrated good central vision, with 10/10 visual acuity (equivalent to 20/20). Full restoration of 20/20 BCVA was obtainable for over 9 years in some patients. Conclusions Theoretical and experimental considerations demonstrate that B-KPro has the optical capacity to restore 20/20 BCVA in patients. Further image quality improvement can be anticipated through correction of HOAs. Translational Relevance We establish an objective benchmark to characterize the optics of the B-KPro and other keratoprosthesis and propose design changes to allow improved vision in B-KPro patients.
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Affiliation(s)
- Pui-Chuen Hui
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.,Schepens Eye Research Institute, Boston Keratoprosthesis Laboratory, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
| | - Leonardo A Pereira
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.,CAPES Foundation, Ministry of Education of Brazil, Brasilia, Brazil
| | - Renald Dore
- University of Rochester, Institute of Optics, Rochester, NY, USA
| | - Shengtong Chen
- University of Rochester, Institute of Optics, Rochester, NY, USA
| | - Elise Taniguchi
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.,Schepens Eye Research Institute, Boston Keratoprosthesis Laboratory, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
| | - James Chodosh
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
| | - Claes H Dohlman
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.,Schepens Eye Research Institute, Boston Keratoprosthesis Laboratory, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
| | - Eleftherios I Paschalis
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA.,Schepens Eye Research Institute, Boston Keratoprosthesis Laboratory, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA
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Objective optical quality in eyes with customized selection of aspheric intraocular lens implantation. BMC Ophthalmol 2019; 19:152. [PMID: 31319806 PMCID: PMC6639902 DOI: 10.1186/s12886-019-1162-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 07/09/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To compare the postoperative optical quality in eyes with customized selection and random selection of aspheric intraocular lens (IOL) implantation. METHODS A prospective, nonrandomized study was implemented in adult cataract patients who underwent unilateral phacoemulsification with aspheric IOL implantation. Patients were allocated into two treatment groups: a customized group and a control group. In the customized group, the aspheric IOL selection was based on the corneal spherical aberration to enable the postoperative target ocular spherical aberration closest to zero; in the control group, the aspheric IOLs were chosen using a random strategy. Primary outcome measurements included the following objective optical quality assessments: higher-order aberrations obtained by a Hartmann-shack aberrometer at 4 mm and 6 mm pupil diameters; objective scatter index (OSI), modulation transfer function (MTF) cut-off, Strehl ratio (SR) and a simulated contrast visual acuity-optical quality analysis system value (OV) obtained by a double-pass system with a 4-mm aperture. Subjective visual acuity was measured as secondary outcome. All the patients were followed up for 3 months. RESULTS Eighty-four patients in the customized group and 78 patients in the control group were evaluated. There was no significant difference in postoperative visual acuity between the two groups (P > 0.05). Significantly less ocular higher-order aberrations were shown in the customized group (P < 0.05). No significant difference was shown in OSI, MTF cut-off, SR and OV between the two groups (P > 0.05). CONCLUSIONS Although customized selection of aspheric IOL implantation showed less postoperative ocular aberrations, it performed similarly to random selection of aspheric IOL implantation in terms of postoperative visual acuity, simulated contrast visual acuity, intraocular scatter, modulation transfer function and Strehl ratio. TRIAL REGISTRATION Retrospectively registered on 07/06/2019. Registration number: ChiCTR1900024356 .
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Leisser C, Hirnschall N, Ullrich M, Findl O. Repeatability of wavefront measurements in pseudophakic eyes. SPEKTRUM DER AUGENHEILKUNDE 2019. [DOI: 10.1007/s00717-018-0419-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Decreased Visual Acuity by an Irregular Corneal Posterior Surface After Repeat Descemet Stripping Automated Endothelial Keratoplasty. Eye Contact Lens 2018; 44 Suppl 1:S249-S254. [DOI: 10.1097/icl.0000000000000394] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Schrecker J, Langenbucher A, Seitz B, Eppig T. First results with a new intraocular lens design for the individual correction of spherical aberration. J Cataract Refract Surg 2018; 44:1211-1219. [PMID: 30120004 DOI: 10.1016/j.jcrs.2018.06.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 06/26/2018] [Accepted: 06/28/2018] [Indexed: 11/19/2022]
Abstract
PURPOSE To assess the feasibility of individual compensation of corneal spherical aberration with a custom intraocular lens (IOL). SETTING Department of Ophthalmology, Rudolf Virchow Klinikum Glauchau, Glauchau, Germany. DESIGN Prospective case series. METHODS Cataract patients were randomized to receive an individual aberration-correcting IOL (Invidua-aA; Group A) or a standard aspheric aberration-free IOL of otherwise identical design (Aspira-aA; Group B). In Group A, the IOL was designed according to preoperative calculation of the corneal spherical aberration Z(4,0). The aim was to achieve an overall postoperative ocular spherical aberration close to zero. Four weeks and 3 months postoperatively, the refraction, visual acuity (far, intermediate, and near distance), photopic and mesopic contrast sensitivities (with and without glare), defocus curve, corneal and ocular spherical aberration, and pupil size were measured. RESULTS Group A, 57 eyes of 42 patients and Group B, 29 eyes of 27 patients. Preoperatively, there was no difference in corneal spherical aberration between groups (P > .05). Three months postoperatively, residual ocular spherical aberration Z(4,0) was significantly lower in Group A (P < .001). Photopic and mesopic contrast sensitivities (with and without glare) were significantly higher in Group A at most spatial frequencies. Monocular defocus curve and distance, intermediate, and near visual acuity outcomes did not differ significantly between groups. CONCLUSIONS Implantation of a custom monofocal aspheric IOL effectively reduced overall ocular spherical aberration. Clinical outcomes indicate that IOLs with an individual spherical aberration correction improve functional vision, especially contrast sensitivity, compared with standard aberration-free IOLs.
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Affiliation(s)
- Jens Schrecker
- Department of Ophthalmology (Schrecker), Rudolf Virchow Klinikum Glauchau, Glauchau, the Institute of Experimental Ophthalmology (Langenbucher, Eppig) and the Department of Ophthalmology (Seitz), Saarland University, Homburg/Saar, Germany.
| | - Achim Langenbucher
- Department of Ophthalmology (Schrecker), Rudolf Virchow Klinikum Glauchau, Glauchau, the Institute of Experimental Ophthalmology (Langenbucher, Eppig) and the Department of Ophthalmology (Seitz), Saarland University, Homburg/Saar, Germany
| | - Berthold Seitz
- Department of Ophthalmology (Schrecker), Rudolf Virchow Klinikum Glauchau, Glauchau, the Institute of Experimental Ophthalmology (Langenbucher, Eppig) and the Department of Ophthalmology (Seitz), Saarland University, Homburg/Saar, Germany
| | - Timo Eppig
- Department of Ophthalmology (Schrecker), Rudolf Virchow Klinikum Glauchau, Glauchau, the Institute of Experimental Ophthalmology (Langenbucher, Eppig) and the Department of Ophthalmology (Seitz), Saarland University, Homburg/Saar, Germany
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Hayashi T, Yamaguchi T, Yuda K, Kato N, Satake Y, Shimazaki J. Topographic characteristics after Descemet's membrane endothelial keratoplasty and Descemet's stripping automated endothelial keratoplasty. PLoS One 2017; 12:e0188832. [PMID: 29190797 PMCID: PMC5708795 DOI: 10.1371/journal.pone.0188832] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Accepted: 11/14/2017] [Indexed: 11/19/2022] Open
Abstract
PURPOSE To investigate the topographic characteristics of the posterior corneal surface after Descemet's endothelial membrane keratoplasty (DMEK) and Descemet's stripping automated endothelial keratoplasty (DSAEK) and their effects on postoperative visual acuity. METHODS Nineteen eyes of 19 patients after DMEK, 23 eyes of 23 patients after DSAEK, and 18 eyes of 18 control subjects were retrospectively analyzed. Best spectacle-corrected visual acuity (BSCVA), aberration factors (higher-order aberrations [HOAs], spherical aberrations [SAs], and coma aberrations [Comas] at 6.0 mm) were evaluated preoperatively and at 1, 3, and 6 months postoperatively. The posterior refractive pattern of the topography map was classified into 5 grades (0-5) (posterior color grade) using anterior segment optical coherence tomography. Correlations between BSCVA and some factors (abbreviation factors, posterior color grade) were analyzed. RESULTS BSCVA was significantly better after DMEK than after DSAEK (P < 0.001). Posterior HOAs, SAs, and Comas after each type of endothelial keratoplasty were significantly greater compared to control (P < 0.01). Posterior HOAs, total/anterior/posterior SAs, and posterior color grade were significantly lower in the DMEK group than in the DSAEK group at 3 months (P < 0.024 [posterior HOAs], P = 0.047 [total SA], P < 0.001 [anterior SAs], P = 0.021 [posterior SAs], and P < 0.001 [posterior color grade]) and 6 months postoperatively (P = 0.034 [posterior HOAs], P < 0.001 [total SAs], P < 0.001 [anterior SAs], P = 0.013 [posterior SAs], and P = 0.004 [posterior color grade]). BSCVA was significantly correlated with HOAs, SAs, and posterior color grade (P < 0.001 for all except anterior HOAs [P = 0.004]). CONCLUSIONS High posterior color grades were associated with larger aberration factors and had a negative effect on visual function after endothelial keratoplasty. Rapid improvement of visual function after DMEK may be attributed to less change at the posterior surface.
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Affiliation(s)
- Takahiko Hayashi
- Department of Ophthalmology, Yokohama Minami Kyosai Hospital, Kanagawa, Japan
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanagawa, Japan
- Department of Ophthalmology, Jichi Medical University, Tochigi, Japan
- Department of Ophthalmology, Saitama Medical University, Saitama, Japan
- * E-mail:
| | - Takefumi Yamaguchi
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Kentaro Yuda
- Department of Ophthalmology, Yokohama Minami Kyosai Hospital, Kanagawa, Japan
- Department of Ophthalmology, Yokohama City University School of Medicine, Kanagawa, Japan
| | - Naoko Kato
- Department of Ophthalmology, Saitama Medical University, Saitama, Japan
| | - Yoshiyuki Satake
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
| | - Jun Shimazaki
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan
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Corneal Higher-Order Aberrations in Infectious Keratitis. Am J Ophthalmol 2017; 175:148-158. [PMID: 28040524 DOI: 10.1016/j.ajo.2016.12.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 12/19/2016] [Accepted: 12/19/2016] [Indexed: 11/22/2022]
Abstract
PURPOSE To characterize the corneal higher-order aberrations (HOAs) in eyes with Acanthamoeba keratitis (AK), bacterial keratitis (BK), and fungal keratitis (FK). DESIGN Retrospective consecutive case series. METHODS This retrospective study includes 18 normal subjects and 63 eyes of 62 consecutive patients with corneal scarring due to AK (20 eyes), BK (35 eyes), and FK (8 eyes) from 2010 to 2016. HOAs of the anterior and posterior surfaces and the total cornea were analyzed by anterior segment optical coherence tomography. Corneal HOA patterns were assigned on the basis of corneal topography maps. Corneal opacity grading was assigned on the basis of slit-lamp examinations. We evaluated corneal HOAs, corneal opacity grading, and their correlation with visual acuity. RESULTS HOAs of the total cornea within a 4-mm diameter were significantly larger in eyes with infectious keratitis (AK, 1.15 ± 2.06 μm; BK, 0.91 ± 0.88 μm; FK, 1.39 ± 1.46 μm) compared with normal controls (0.09 ± 0.01 μm, all, P < .001). Asymmetric pattern was the most common topographic pattern (30% in AK, 51.4% in BK, and 37.5% in FK), followed by the protrusion patterns (10% in AK, 20% in BK, and 12.5% in FK). The visual acuity significantly correlated with HOAs (anterior surface: R = 0.764, P < .0001; posterior surface: R = 0.745, P < .0001; total cornea: R = 0.669, P < .0001). CONCLUSIONS Larger corneal HOAs in patients with infectious keratitis were associated with poorer visual acuity values. Asymmetric pattern was the most common topographic pattern in infectious keratitis.
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Tandogan T, Auffarth GU, Choi CY, Liebing S, Mayer C, Khoramnia R. In vitro comparative optical bench analysis of a spherical and aspheric optic design of the same IOL model. BMC Ophthalmol 2017; 17:9. [PMID: 28178942 PMCID: PMC5299728 DOI: 10.1186/s12886-017-0407-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Accepted: 01/27/2017] [Indexed: 11/16/2022] Open
Abstract
Background To analyse objective optical properties of the spherical and aspheric design of the same intraocular lens (IOL) model using optical bench analysis. Methods This study entailed a comparative analysis of 10 spherical C-flex 570 C and 10 aspheric C-flex 970 C IOLs (Rayner Intraocular Lenses Ltd., Hove, UK) of 26 diopters [D] using an optical bench (OptiSpheric, Trioptics, Germany). In all lenses, we evaluated the modulation transfer function (MTF) at 50 lp/mm and 100 lp/mm and the Strehl Ratio using a 3-mm (photopic) and 4.5-mm (mesopic) aperture. Results At 50 lp/mm, the MTF values were 0.713/0.805 (C-flex 570 C/C-flex 970 C) for a 3-mm aperture and 0.294/0.591 for a 4.5-mm aperture. At 100 lp/mm, the MTF values were 0.524/0.634 for a 3-mm aperture and 0.198/0.344 for a 4.5-mm aperture. The Strehl Ratio was 0.806/0.925 and 0.237/0.479 for a 3-mm and 4.5-mm aperture respectively. A Mann–Whitney U test revealed all intergroup differences to be statistically significant (p < 0.01). Conclusion The aspheric IOL design achieved higher MTF values than the spherical design of the same IOL for both apertures. Moreover, the differences between the two designs of the IOL were more prominent for larger apertures. This suggests that the evaluated IOL provides enhanced optical quality to patients with larger pupils or working under mesopic conditions.
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Affiliation(s)
- Tamer Tandogan
- David J Apple International Laboratory for Ocular Pathology and International Vision Correction Research Centre (IVCRC), Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, 69120, Germany.
| | - Gerd U Auffarth
- David J Apple International Laboratory for Ocular Pathology and International Vision Correction Research Centre (IVCRC), Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, 69120, Germany
| | - Chul Y Choi
- David J Apple International Laboratory for Ocular Pathology and International Vision Correction Research Centre (IVCRC), Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, 69120, Germany.,Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Pyeong-dong, Jongno-gu, Seoul, South Korea
| | - Stephanie Liebing
- David J Apple International Laboratory for Ocular Pathology and International Vision Correction Research Centre (IVCRC), Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, 69120, Germany
| | - Christian Mayer
- Eye Clinic, Klinikum rechts der Isar der Technischen Universität München, Munich, Germany
| | - Ramin Khoramnia
- David J Apple International Laboratory for Ocular Pathology and International Vision Correction Research Centre (IVCRC), Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, 69120, Germany
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Papadatou E, Del Águila-Carrasco AJ, Marín-Franch I, López-Gil N. Temporal multiplexing with adaptive optics for simultaneous vision. BIOMEDICAL OPTICS EXPRESS 2016; 7:4102-4113. [PMID: 27867718 PMCID: PMC5102541 DOI: 10.1364/boe.7.004102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 08/17/2016] [Accepted: 08/19/2016] [Indexed: 05/27/2023]
Abstract
We present and test a methodology for generating simultaneous vision with a deformable mirror that changed shape at 50 Hz between two vergences: 0 D (far vision) and -2.5 D (near vision). Different bifocal designs, including toric and combinations of spherical aberration, were simulated and assessed objectively. We found that typical corneal aberrations of a 60-year-old subject changes the shape of objective through-focus curves of a perfect bifocal lens. This methodology can be used to investigate subjective visual performance for different multifocal contact or intraocular lens designs.
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Affiliation(s)
- Eleni Papadatou
- Optomety Research Group, Facultad de Física, Universidad de Valencia, Spain
| | | | - Iván Marín-Franch
- Optomety Research Group, Facultad de Física, Universidad de Valencia, Spain
- CiViUM Research Group, Facultad de Óptica y Optometría, Universidad de Murcia, Spain
| | - Norberto López-Gil
- CiViUM Research Group, Facultad de Óptica y Optometría, Universidad de Murcia, Spain
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Yagi-Yaguchi Y, Yamaguchi T, Okuyama Y, Satake Y, Tsubota K, Shimazaki J. Corneal Higher Order Aberrations in Granular, Lattice and Macular Corneal Dystrophies. PLoS One 2016; 11:e0161075. [PMID: 27536778 PMCID: PMC4990250 DOI: 10.1371/journal.pone.0161075] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 07/29/2016] [Indexed: 11/25/2022] Open
Abstract
Purpose To evaluate the corneal higher-order aberrations (HOAs) in granular, lattice and macular corneal dystrophies. Methods This retrospective study includes consecutive patients who were diagnosed as granular corneal dystrophy type2 (GCD2; 121 eyes), lattice corneal dystrophies type 1, type 3A (LCDI; 20 eyes, LCDIIIA; 32 eyes) and macular corneal dystrophies (MCD; 13 eyes), and 18 healthy control eyes. Corneal HOAs were calculated using anterior segment optical coherence tomography, and the correlations between HOAs and visual acuity were analyzed. Results HOAs of the total cornea within 4 mm diameter were significantly larger in GCD2 (0.17 ± 0.35 μm), in LCDI (0.33 ± 0.27), LCDIIIA (0.61 ± 1.56) and in MCD (0.23 ± 0.18), compared with healthy controls (0.09 ± 0.02μm, all P < 0.01). HOAs of the total cornea within 6 mm diameter were significantly larger in GCD2 (0.32 ± 0.48), in LCDI (0.60 ± 0.46), LCDIIIA (0.83 ± 2.29) and in MCD (0.44 ± 0.24), compared with healthy controls (0.19 ± 0.06, all P < 0.001). In GCD2, there was no significant correlation between logMAR and HOAs (r = 0.113, P = 0.227). In MCD, LCDI and LCDIIIA, logMAR was positively significantly correlated with HOAs (r = 0.620 and P = 0.028, r = 0.587 and P = 0.007, r = 0.614 and P < 0.001, respectively). Conclusions Increased HOAs occur in eyes with corneal dystrophies, especially in eye with LCD and MCD. Larger amount corneal HOAs are associated with poorer visual acuity in patients with LCD and MCD.
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Affiliation(s)
- Yukari Yagi-Yaguchi
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College, Chiba, Japan
| | - Takefumi Yamaguchi
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College, Chiba, Japan
- * E-mail:
| | - Yumi Okuyama
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College, Chiba, Japan
| | - Yoshiyuki Satake
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College, Chiba, Japan
| | - Kazuo Tsubota
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Jun Shimazaki
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College, Chiba, Japan
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Wadbro E, Hallberg P, Schedin S. Optimization of an intraocular lens for correction of advanced corneal refractive errors. APPLIED OPTICS 2016; 55:4378-4382. [PMID: 27411190 DOI: 10.1364/ao.55.004378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Based on numerical 3D ray tracing, we propose a new procedure to optimize personalized intra-ocular lenses (IOLs). The 3D ray tracing was based on measured corneal elevation data from patients who suffered from advanced keratoconus. A mathematical shape description of the posterior IOL surface, by means of a tensor product cubic Hermite spline, was implemented. The optimized lenses provide significantly reduced aberrations. Our results include a trade-off study that suggests that it is possible to considerably reduce the aberrations with only minor perturbations of an ideal spherical lens. The proposed procedure can be applied for correction of aberrations of any optical system by modifying a single surface.
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Wang L, Shoukfeh O, Koch DD. Custom selection of aspheric intraocular lens in eyes with previous hyperopic corneal surgery. J Cataract Refract Surg 2016; 41:2652-63. [PMID: 26796446 DOI: 10.1016/j.jcrs.2015.06.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/04/2015] [Accepted: 06/07/2015] [Indexed: 11/16/2022]
Abstract
PURPOSE To determine the optimum amount of spherical aberration in intra-ocular lenses (IOLs) to maximize optical quality in eyes with previous hyperopic corneal surgery. SETTING Cullen Eye Institute, Baylor College of Medicine, Houston, Texas. DESIGN Theoretical simulation study. METHODS The amount of spherical aberration in the IOL was varied to produce residual ocular spherical aberration ranging from -0.50 to +0.50 μm. With the use of the Zernike Tool Program, the polychromatic point-spread function with Stiles-Crawford effect was calculated for 6.0 mm and 4.0 mm pupils and defocus of 0.00 diopter (D), -0.50 D, and +0.50 D. The IOL spherical aberration at which maximum image quality was achieved was determined. Stepwise multiple regression analysis was performed to assess the predictors of optimum IOL spherical aberration. RESULTS Aspheric IOL implantation was simulated in 106 eyes of 80 patients; ages ranged from 40 to 59 years. With 0.00 D, -0.50 D, and +0.50 D defocus, respectively, the ranges of 25th to 75th percentiles of the optimum IOL spherical aberration were -0.12 to +0.20 μm, +0.10 to +0.42 μm, and -0.35 to -0.03 μm for the 6.0 mm pupil and -0.14 to +0.26 μm, +0.41 to +0.86 μm, and -0.74 to -0.24 μm for the 4.0 mm pupil. The amount of optimum IOL spherical aberration could be predicted on the basis of other higher-order aberrations (HOAs) of the cornea with multiple correlation coefficients up to 0.98. CONCLUSIONS The amount of IOL spherical aberration producing the best image quality in eyes with previous hyperopic corneal surgery varied widely and could be predicted on the basis of the full spectrum of corneal HOAs. FINANCIAL DISCLOSURE Supported in part by an unrestricted grant from Research to Prevent Blindness, New York, New York. No author has a financial or proprietary interest in any material or method mentioned.
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Affiliation(s)
- Li Wang
- From Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas
| | - Omar Shoukfeh
- From Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas
| | - Douglas D Koch
- From Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas.
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Holladay JT. Effect of corneal asphericity and spherical aberration on intraocular lens power calculations. J Cataract Refract Surg 2015; 41:1553-4. [PMID: 26287912 DOI: 10.1016/j.jcrs.2015.06.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 06/14/2015] [Indexed: 11/27/2022]
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15
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Jia LX, Li ZH. Clinical study of customized aspherical intraocular lens implants. Int J Ophthalmol 2014; 7:816-21. [PMID: 25349799 DOI: 10.3980/j.issn.2222-3959.2014.05.14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 07/14/2014] [Indexed: 11/02/2022] Open
Abstract
AIM To compare if there is an improvement in visual functions with age-related cataracts between patients receiving a aspherical intraocular lens (IOL) based on corneal wavefront aberration and patients randomly assigned lenses. METHODS A total of 124 eyes of 124 patients with age-related cataracts were placed in experimental group and a group receiving randomly assigned (RA) lenses. The experimental group was undergone Pentacam corneal spherical aberration measurement before surgery; the targeted range for residual total spherical aberration after surgery was set to 0-0.3 µm. Patients with a corneal spherical aberration <0.3 µm were implanted with a zero-spherical aberration advanced optics (AO) aspherical IOL and patients with an aberration ≥0.3 µm received a Tecnis Z9003 aspherical lens in experimental group. RA patients were randomly implanted with an AO lens or a Tecnis Z9003 lens. Three months after surgery total spherical aberration, photopic/mesopic contrast sensitivities, photopic/mesopic with glare contrast sensitivities, and logMAR vision were measured. RESULTS Statistical analysis on logMAR vision showed no significant difference between two groups (P=0.413). The post-surgical total spherical aberration was 0.126±0.097 µm and 0.152±0.151 µm in the experimental and RA groups, respectively (P=0.12). The mesopic contrast sensitivities at spatial frequencies of 6, 12 and 18 c/d in the experimental group were significantly higher than of the RA group (P=0.00; P=0.04; P=0.02). The mesopic with glare contrast sensitivity in the experimental group at a spatial frequency of 18 c/d was also significantly higher vs the RA group (P=0.01). CONCLUSION Pre-surgical corneal spherical aberration measurement in cataract patients followed by customized selection of aspherical IOL implants improved mesopic contrast sensitivities at high spatial frequencies, and thus is a superior strategy compared to the random selection of aspherical IOL implants.
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Affiliation(s)
- Lie-Xi Jia
- Department of Ophthalmology, Chinese PLA General Hospital, Beijing 100853, China
| | - Zhao-Hui Li
- Department of Ophthalmology, Chinese PLA General Hospital, Beijing 100853, China
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16
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Pallikaris IG, Portaliou DM, Kymionis GD, Panagopoulou SI, Kounis GA. Outcomes after accommodative bioanalogic intraocular lens implantation. J Refract Surg 2014; 30:402-6. [PMID: 24972406 DOI: 10.3928/1081597x-20140520-01] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 02/17/2014] [Indexed: 11/20/2022]
Abstract
PURPOSE To evaluate the outcomes after Wichterle Intraocular Lens-Continuous Focus (Medicem, Kamenné Zehrovice, Czech Republic) accommodative bioanalogic intraocular lens implantation. METHODS In this prospective case series, 50 eyes of 25 patients (mean age: 65.3 ± 8.4 years; range: 53 to 83 years) were included. All patients underwent routine cataract surgery and Wichterle Intraocular Lens-Continuous Focus implantation. RESULTS Mean follow-up was 11.44 ± 2.46 months (range: 9 to 17 months). Both monocular uncorrected and corrected distance visual acuity statistically and significantly (P < .05) improved from 0.31 ± 0.17 (20/63 Snellen) (range: counting fingers to 0.7) to 0.74 ± 0.19 (20/25 Snellen) (range: 0.2 to 1) and from 0.61 ± 0.19 (20/32 Snellen) (range: 0.2 to 1) to 0.82 ± 0.13 (20/25 Snellen) (range: 0.4 to 1), respectively. Target postoperative refraction was -0.5 diopters (D) and preoperative and 1-year postoperative spherical equivalent refraction were 0.72 ± 2.71 D (range: -7.25 to 2.37 D) and -0.24 ± 0.65 D (range: -1.0 to 1.0 D), respectively. No eyes lost lines of corrected distance visual acuity during the follow-up period, whereas 88% of patients gained one or more lines of corrected distance visual acuity. Uncorrected intermediate and near visual acuity were J2 (Snellen 20/25) or better in 72% of patients. No complications occurred intraoperatively or postoperatively. The evaluation of the mean values of root mean square of third and fourth order higher-order aberrations at 1 year postoperatively revealed a mean negative spherical aberration of -0.18 ± 0.13 μm. CONCLUSIONS Wichterle Intraocular Lens-Continuous Focus accommodative bioanalogic IOL implantation provides satisfactory visual acuity for far, intermediate, and near distances and the promising results remain stable throughout the follow-up period.
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Karavitaki AE, Pallikaris IG, Panagopoulou SI, Kounis GA, Kontadakis G, Kymionis GD. Long-term visual outcomes after Crystalens(®) HD intraocular lens implantation. Clin Ophthalmol 2014; 8:937-43. [PMID: 24899793 PMCID: PMC4039401 DOI: 10.2147/opth.s57009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Purpose Our purpose was to evaluate the long-term visual outcomes after bilateral implantation of Crystalens® HD (Bausch and Lomb, Inc.) accommodative intraocular lenses. Methods In this study, 25 patients (50 eyes) who underwent cataract surgery and bilateral Crystalens HD accommodative intraocular lens implantation were included. The Crystalens HD lens was implanted in the bag in both eyes, without any intra- or postoperative complications. The visual parameters measured before and after surgery were: uncorrected distance visual acuity, corrected distance visual acuity (CDVA) (using the Early Diabetic Retinopathy Study [EDTRS] logMAR charts), uncorrected intermediate visual acuity, and uncorrected near visual acuity using a Birkhäuser reading chart, at a distance of 66 cm and 33 cm for intermediate and near vision, respectively, directly illuminated by a lamp of 60 watts. After surgery, the patients were evaluated at 1, 3, 6, 12, 24, and 36 months. Results The mean age was 68.70±7.1 (range: 54 to 83) years. The mean follow-up was 42.72±0.49 (range: 42.33 to 43.27) months. The uncorrected distance visual acuity improved from 0.56±0.41 (range: 0 to 2) preoperatively to 0.19±0.13 (range: 0 to 0.38) (logMAR scale) at the last follow-up visit, and the CDVA improved from 0.17±0.18 (range: 0 to 0.7) preoperatively to 0.05±0.05 (range: −0.02 to 0.22) at the last follow-up visit. No eyes lost lines of CDVA during the follow-up period, while 54% of patients gained one or more lines of CDVA. The uncorrected intermediate and near visual acuity was J2 or better in 71% and 69% of our patients, respectively. Conclusion Crystalens HD implantation seems to provide an improvement in visual acuity for far, intermediate, and near distances.
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Affiliation(s)
| | | | | | - George A Kounis
- Institute of Vision and Optics, University of Crete, Crete, Greece
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Lee J, Choi HJ, Kim MK, Wee WR. Clinical Outcomes of Cataract Surgery with Correction of Corneal Spherical Aberration. JOURNAL OF THE KOREAN OPHTHALMOLOGICAL SOCIETY 2014. [DOI: 10.3341/jkos.2014.55.6.809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Jinho Lee
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
| | - Hyuk Jin Choi
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
- Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
| | - Mee Kum Kim
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
| | - Won Ryang Wee
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
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Tarfaoui N, Nochez Y, Luong TH, Majzoub S, Pisella PJ. [Use of "mix-and-match" aspheric intraocular lenses in cataract surgery to enhance depth of field and stereoscopic performance]. J Fr Ophtalmol 2012; 36:55-61. [PMID: 23069327 DOI: 10.1016/j.jfo.2012.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 02/20/2012] [Indexed: 11/29/2022]
Abstract
INTRODUCTION One of the remaining challenges in cataract surgery is to compensate for lost accommodative function. The purpose of our study is to evaluate reading ability with a combination of two different aspheric intraocular lenses. PATIENTS AND METHODS This retrospective study included 40 eyes (20 patients). The control group (28 eyes, 14 patients) received two negative aspheric intraocular lenses (Acrismart 36A(®), Carl Zeiss Meditec), while the aspheric-optimized group (12 eyes, six patients) received an AcriSmart 36A(®) in the dominant eye and a zero-aspheric intraocular lens (Acrismart 46 LC(®), Carl Zeiss Meditec) in the fellow eye. Patients with corneal asphericity between 0.15 and 0.30 μm and a bilateral monocular postoperative visual acuity of at least 20/20 were eligible for inclusion. Uncorrected and best corrected visual acuity was measured for near, intermediate and distance vision. Corneal and total higher-order aberrations, monocular and binocular defocus curve, and stereoscopic performance were assessed. RESULTS Postoperative spherical equivalent and best corrected distance visual acuity were not significantly different between the two groups (P=0.11 and P=0.82 respectively). However, the aspheric-optimized group (36A(®)/46 LC(®)) exhibited better near and intermediate visual acuity (P<0.05), and better stereoscopic vision (P=0.027). DISCUSSION The depth of field results in pseudophakes implanted with "mix-and-match" aspheric lenses demonstrates that the binocular combination of two different aspheric profiles seems to improve near vision without affecting stereoscopic vision.
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Affiliation(s)
- N Tarfaoui
- Service d'ophtalmologie, CHU de Bretonneau, 2, boulevard Tonnellé, 37000 Tours, France.
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Gong XH, Zheng QX, Wang N, Chen D, Zhao J, Li J, Zhao YE. Visual and optical performance of eyes with different corneal spherical aberration implanted with aspheric intraocular lens. Int J Ophthalmol 2012; 5:323-8. [PMID: 22773981 DOI: 10.3980/j.issn.2222-3959.2012.03.14] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2012] [Accepted: 05/25/2012] [Indexed: 11/02/2022] Open
Abstract
AIM To compare the visual and optical performance of eyes with different corneal spherical aberration (SA) implanted with spherical aberration-free intraocular lens (IOLs). METHODS Thirty-six patients with different corneal SA had phacoemulsification with implantation of spherical aberration-free IOLs. Patients were divided into 3 groups according to the value of preoperative corneal SA. Eyes with corneal SA <0.10µm were assigned to group A, those with 0.10 ≤corneal SA <0.20µm to Group B, and those with 0.20≤ corneal SA <0.35µm to Group C. Best-corrected visual acuity (BCVA), contrast sensitivity, corneal SA, total ocular aberrations, and depth of focus were recorded 3 months postoperatively. Distance-corrected near and intermediate visual acuity was studied to measure depth of focus. RESULTS BCVA and contrast sensitivity were similar between groups. There were no significant differences in distance-corrected near or intermediate visual acuity. Corneal SA was similar before and 3 months after surgery in the 3 groups. With a 5.0mm pupil diameter, root mean square values for total ocular higher-order aberrations (HOAs) were lower in groups A and B than in group C. Total ocular SA was lower in group A than in groups B and C. SA was also lower in group B than in group C. Coma and trefoil were similar between the groups. CONCLUSION Implantation of spherical aberration-free IOLs in eyes with different corneal SA results in similar visual performance at BCVA, contrast sensitivity and depth of focus.
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Affiliation(s)
- Xian-Hui Gong
- School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical College, Wenzhou 325027, Zhejiang Province, China
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Guo H, Goncharov AV, Dainty C. Comparison of retinal image quality with spherical and customized aspheric intraocular lenses. BIOMEDICAL OPTICS EXPRESS 2012; 3:681-691. [PMID: 22574257 PMCID: PMC3345798 DOI: 10.1364/boe.3.000681] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 02/20/2012] [Accepted: 02/24/2012] [Indexed: 05/29/2023]
Abstract
We hypothesize that an intraocular lens (IOL) with higher-order aspheric surfaces customized for an individual eye provides improved retinal image quality, despite the misalignments that accompany cataract surgery. To test this hypothesis, ray-tracing eye models were used to investigate 10 designs of mono-focal single lens IOLs with rotationally symmetric spherical, aspheric, and customized surfaces. Retinal image quality of pseudo-phakic eyes using these IOLs together with individual variations in ocular and IOL parameters, are evaluated using a Monte Carlo analysis. We conclude that customized lenses should give improved retinal image quality despite the random errors resulting from IOL insertion.
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Nochez Y, Majzoub S, Pisella PJ. Effect of interaction of macroaberrations and scattered light on objective quality of vision in pseudophakic eyes with aspheric monofocal intraocular lenses. J Cataract Refract Surg 2012; 38:633-40. [PMID: 22317956 DOI: 10.1016/j.jcrs.2011.11.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2011] [Revised: 11/04/2011] [Accepted: 11/08/2011] [Indexed: 10/14/2022]
Abstract
PURPOSE To assess the impact of wavefront ocular aberrations on objective vision quality and depth of focus in pseudophakic patients. SETTING University Hospital Bretonneau of Tours, Francois Rabelais Medicine Faculty of Tours, France. DESIGN Cohort study. METHODS Consecutive eyes having implantation of an aspheric monofocal intraocular lens (IOL) (Acri.Smart) were studied. Aberrometry measurements were performed under mesopic conditions with a 6.0 mm pupil using a Wavescan aberrometer. Objective evaluation of optical vision quality was performed using the Optical Quality Analysis System II. The 3 measurements were the modulation transfer function values (MTF cutoff); objective depth of focus, which was computed as the focus range at which Strehl ratio did not fall below 50% of the maximum; and the objective scatter index. RESULTS Fifty-four eyes (30 patients) were enrolled. Six months postoperatively, MTF cutoff values were increased with decreasing total ocular spherical aberration, ocular trefoil, and 2nd-order astigmatism (P<.05). Objective depth of focus was positively correlated with 2nd-order astigmatism (r(2) = 0.171, P<.001) and total spherical aberration (r(2) = 0.091, P=.028). Objective scatter was more beneficial for depth of focus, with a significantly positive correlation with this parameter (r(2) = 0.28, P=.002), than compromising of optical quality (no significant correlation with MTF measurements in same multiple regression analysis). CONCLUSION Three ocular aberrations (2nd-order astigmatism, trefoil, spherical aberration) seemed to interact with objective contrast sensitivity and depth of focus, whereas residual spherical aberration exerted opposite effects on image quality in individual patients.
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Affiliation(s)
- Yannick Nochez
- Department of Ophthalmology, University Hospital of Tours, Tours, France.
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Wavefront analysis and Zernike polynomial decomposition for evaluation of corneal optical quality. J Cataract Refract Surg 2011; 38:343-56. [PMID: 22176886 DOI: 10.1016/j.jcrs.2011.11.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 09/09/2011] [Accepted: 10/07/2011] [Indexed: 11/20/2022]
Abstract
Wavefront-guided excimer laser refractive surgery and new customized intraocular lens and contact lens designs are major clinical applications of corneal wavefront analysis. Other therapeutic applications include corneal disorders, conventional excimer laser refractive surgery, incisional techniques and cataract surgery, corneal transplantation, intrastromal corneal ring segment implantation, and crosslinking therapy. Basic data regarding corneal wavefront aberrations, such as distribution in the population and changes with aging, are essential for understanding the nature of each aberration and correcting it. Corneal aberrometry also improved our comprehension of the optical effects of the aforementioned topics while helping us assess the success of the procedures. Zernike polynomials are representations of the higher- and lower-order aberrations of the cornea, allowing a mathematical approach to their determination. Polynomials are used to model individual components of the wavefront in familiar terms. This article reviews the current knowledge of the wavefront aberrations of the human cornea and analyzes studies in the fields of anterior segment surgery and/or therapy, diseases, and optical quality in the context of this knowledge.
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Abstract
PURPOSE To present a bi-sign aspheric intraocular lens (IOL) and make theoretical comparisons with spherical and one-sign aspheric IOLs for retinal image quality in mesopic conditions and intermediate image capability in photopic conditions. METHODS Using ray-tracing in pseudophakic eye models, retinal image quality in terms of modulation transfer function was analyzed between the bi-sign aspheric and three types of one-sign aspheric IOLs and the spherical IOL for the range of corneal asphericities and different lens misalignments at 5 mm pupil diameter; comparison is made with the spherical IOL at defocus conditions characterized by negative refractive errors at 3 mm pupil diameter. RESULTS Retinal image quality of the bi-sign aspheric lens was equal to or exceeded the one-sign aspheric and spherical IOLs in the majority of anterior cornea asphericities and lens misalignments within the spatial frequencies of 6 to 15 c/deg. Intermediate image capability of the bi-sign aspheric exceeded the spherical IOL. CONCLUSIONS A new bi-sign aspheric lens produces regions of opposite spherical aberrations in the eye model with pupil diameters above 3 mm to balance out aberrations within the lens itself in addition to compensating corneal aberration as with a one-sign aspheric lens. This allows reduction in the variability of the retinal image quality at different anterior cornea asphericities and lens misalignments, when compared with a one-sign aspheric and spherical lens. The bi-sign aspheric produces positive longitudinal spherical aberration in the eye model within 3 mm pupil diameter that improves intermediate image capability when compared with the spherical IOL.
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Corneal topographic analysis in patients with keratoconus using 3-dimensional anterior segment optical coherence tomography. J Cataract Refract Surg 2011; 37:1871-8. [PMID: 21930048 DOI: 10.1016/j.jcrs.2011.05.027] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 04/05/2011] [Accepted: 05/02/2011] [Indexed: 11/20/2022]
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Siegel NH, Munir WM. Effect of variation in derived corneal wavefront aberrations by calculation methods on intraocular lens selection. J Refract Surg 2011; 27:821-5. [PMID: 21919430 DOI: 10.3928/1081597x-20110913-02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Accepted: 08/08/2011] [Indexed: 11/20/2022]
Abstract
PURPOSE To compare topographically derived corneal wavefront aberrations between the NIDEK Magellan corneal topographer with built-in software (NIDEK Co Ltd) and VOL-CT software (Sarver and Associates) and determine their effects on intraocular lens (IOL) choice based on spherical aberration profiles. METHODS Data were collected prospectively for 28 eyes without existing corneal disease prior to undergoing cataract surgery. Corneal higher order aberrations were calculated using Zernike polynomial expansions from topographic data and compared between the builtin NIDEK software and VOL-CT software. RESULTS Using two-tailed paired t tests, statistically significant (P<.05) differences were found between the two calculations at 4 mm for 4th order aberrations (NIDEK: 0.2005 μm, VOL-CT: 0.1202 μm) and 6th order aberrations (NIDEK: 0.0985 μm, VOL-CT: 0.0546 μm). Statistically significant differences were noted between the two calculations at 6 mm for 5th order aberrations (NIDEK: 0.2757 μm, VOL-CT: 0.1618 μm) and 6th order aberrations (NIDEK: 0.2641 μm, VOL-CT: 0.0920 μm). No statistically significant differences existed for 3rd order, spherical aberration, and total higher order aberrations. However, using spherical aberration-based IOL selection criteria, the ultimate IOL selection would have differed in 13 eyes if calculated using the NIDEK versus VOL-CT software. CONCLUSIONS Statistically significant differences were present in wavefront aberration calculations using the NIDEK versus VOL-CT software for 4- and 6-mm pupil sizes. These differences in spherical aberration could influence wavefront-optimized IOL selection for cataract surgery.
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Affiliation(s)
- Nicole Hauptman Siegel
- Department of Ophthalmology, Boston University School of Medicine, Boston Medical Center, Massachussetts, USA
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McKelvie J, McArdle B, McGhee C. The Influence of Tilt, Decentration, and Pupil Size on the Higher-Order Aberration Profile of Aspheric Intraocular Lenses. Ophthalmology 2011; 118:1724-31. [DOI: 10.1016/j.ophtha.2011.02.025] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 02/13/2011] [Accepted: 02/14/2011] [Indexed: 12/18/2022] Open
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Effect of residual ocular spherical aberration on objective and subjective quality of vision in pseudophakic eyes. J Cataract Refract Surg 2011; 37:1076-81. [PMID: 21596250 DOI: 10.1016/j.jcrs.2010.12.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 12/15/2010] [Accepted: 12/16/2010] [Indexed: 11/23/2022]
Abstract
PURPOSE To determine the level of residual spherical aberration that gives the best objective and subjective quality of image after cataract surgery with intraocular lens (IOL) implantation. SETTING Department of Ophthalmology, CHU Bretonneau, Tours, France. DESIGN Cohort study. METHODS Six months after microincision (1.8 mm) cataract surgery with aspheric IOL implantation, total aberrations were computed using a Wavescan aberrometer. The modulation transfer function (MTF), Strehl ratio, and objective index of scattering were measured using the Objective Quality Analysis System. Objective depth of focus was computed as the focus range at which the Strehl ratio did not fall below 50% of maximum. Subjective depth of focus was calculated as the difference between the vergence of the punctum remotum and that of the punctum proximum. RESULTS Thirty patients (54 eyes) were evaluated. The MTF cutoff values were higher with decreasing total ocular spherical aberration (r = 0.56; P < .05). Objective and subjective depth of focus were positively correlated with total spherical aberration (r = 0.26 and r = 0.46, respectively; P < .05). CONCLUSIONS A final spherical aberration of zero obtained by compensation of IOL asphericity gave the greatest improvement in objective quality of vision and better MTF contrast. However, a final target ocular spherical aberration between 0.07 μm and 0.10 μm should be considered to be the best compromise between subjective depth of focus and objective contrast sensitivity. FINANCIAL DISCLOSURE No author has a financial or proprietary interest in any material or method mentioned.
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Bottos KM, Leite MT, Aventura-Isidro M, Bernabe-Ko J, Wongpitoonpiya N, Ong-Camara NH, Purcell TL, Schanzlin DJ. Corneal asphericity and spherical aberration after refractive surgery. J Cataract Refract Surg 2011; 37:1109-15. [PMID: 21596254 DOI: 10.1016/j.jcrs.2010.12.058] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 11/17/2010] [Accepted: 12/07/2010] [Indexed: 11/28/2022]
Abstract
PURPOSE To evaluate changes in corneal asphericity (Q) and spherical aberrations after refractive surgery using Scheimpflug imaging. SETTING University of California, San Diego, Shiley Eye Center, La Jolla, California, USA. DESIGN Cohort study. METHODS After wavefront-guided laser in situ keratomileusis, patients within ± 0.50 diopter of plano and with an uncorrected distance visual acuity of at least 20/20 were evaluated. The Q values and corneal spherical aberration Zernike values were obtained using Scheimpflug imaging preoperatively and 1 to 3 months postoperatively. RESULTS The study enrolled 177 myopic eyes and 32 hyperopic eyes. The mean Q value was -0.28 ± 0.11 (SD) and -0.22 ± 0.15, respectively, preoperatively and +0.35 ± 0.44 and -0.64 ± 0.31, respectively, postoperatively. The asphericity change was highly correlated with preoperative spherical equivalent (r(2) = 0.81; P ≤ .001). The mean corneal spherical aberration was +0.21 ± 0.08 μm in myopic eyes and +0.36 ± 0.11 μm in hyperopic eyes preoperatively and +0.36 ± 0.17 μm and 0.00 ± 0.29 μm, respectively, postoperatively. The corneal spherical aberration changes were correlated with the amount of preoperative refractive error (r(2) = 0.34; P < .001). There was a tendency for Q values and spherical aberrations to become more positive after myopic ablation and more negative after hyperopic ablation. CONCLUSIONS Myopic and hyperopic corrections induced changes in the Q value and spherical aberrations in opposite directions (ie, positive and negative, respectively). The changes depended on the magnitude of the refractive correction. FINANCIAL DISCLOSURE No author has a financial or proprietary interest in any material or method mentioned.
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Affiliation(s)
- Katia M Bottos
- Shiley Eye Center, University of California San Diego, La Jolla, California, USA
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Prospective multicenter trial assessing effectiveness, refractive predictability and safety of a new aberration free, bi-aspheric intraocular lens. Cont Lens Anterior Eye 2011; 34:188-92. [PMID: 21616703 DOI: 10.1016/j.clae.2011.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 04/14/2011] [Accepted: 04/14/2011] [Indexed: 11/22/2022]
Abstract
PURPOSE To determine the effectiveness and safety of the Softec HD IOL; and to present refractive outcomes for lenses manufactured at an IOL power tolerance of 0.11 D. METHODS Three-hundred and ninety adult patients requiring removal of a cataractous lens with implantation of a monofocal IOL in at least one eye were eligible for study participation across eight US investigative sites. Patients were enrolled unilaterally. After routine surgery, subjects were examined for adverse events (AEs), best corrected visual acuity (BCVA) and manifest refraction correction at 12 months postoperatively. RESULTS Three-hundred and sixty-six (95%) of patients completed the 12-month postoperative visit. The percent of patients achieving best corrected Snellen acuity 20/40 or better was 98.9%, and 81.1% of patients achieved best corrected Snellen acuity 20/25 or better. Of those patients (80%) implanted with a lens available in 0.25 D increments (manufactured at a tolerance of 0.11 D) 40.9%, 69.8% and 93.8% of patients were within ±0.25 D, ±0.50 D and ±1.0 D of predicted target refraction respectively. Overall incidence of cumulative and persistent IOL Grid AEs was 2.2% with no AE meeting or exceeding the FDA Grid of Historical Controls. CONCLUSIONS The Softec HD IOL is a safe and effective lens. The high manufacturing tolerance of the lens appears to enhance refractive outcomes.
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Lee KM, Park SH, Joo CK. Comparison of clinical outcomes with three different aspheric intraocular lenses. Acta Ophthalmol 2011; 89:40-6. [PMID: 20636488 DOI: 10.1111/j.1755-3768.2009.01620.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE To compare the quality of vision achieved with different aspheric intraocular lens (IOL) implants. METHODS This prospective, comparative and randomized study included 90 eyes that underwent phacoemulsification and implantation with one of three different aspheric IOLs. Patients were assigned randomly to receive one type of aspheric IOL: Tecnis Z9003(®) (Advanced Medical Optics, Santa Ana, California, USA) (Group A), Acrysof IQ SN60WF(®) (Alcon Laboratories, Fort Worth, Texas, USA) (Group B) or Akreos ADAPT-AO(®) (Bausch & Lomb, Rochester, New York, USA) (Group C). Ophthalmic examinations, including uncorrected visual acuity, best spectacle-corrected visual acuity (BCVA), refractive error, wavefront analysis, contrast sensitivity under mesopic and photopic conditions, and a subjective questionnaire, were performed postoperatively. RESULTS The mean BCVA, mean refractive error and high-order aberrations were not significantly different among the three groups. The spherical aberrations were 0.0021 ± 0.096 for group A, 0.048 ± 0.071 for group B and 0.11 ± 0.089 for group C, indicating a significantly lower magnitude in group A (p = 0.012). In addition, group A showed significantly better results in contrast sensitivity under mesopic (p = 0.042) and photopic (p = 0.047, 0.049) conditions at low spatial frequencies. Nevertheless, postoperative patient satisfaction was not different among the three groups. CONCLUSION The Tecnis Z9003(®) IOL reduced spherical aberrations and improved contrast sensitivity under mesopic and photopic conditions at low spatial frequencies. Nevertheless, the final visual quality was not different among the three groups.
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Affiliation(s)
- Kyung-Min Lee
- Department of Ophthalmology and Visual Science, Catholic University of Korea, Seoul, Korea
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Ale JB, Manns F, Ho A. Magnifications of single and dual element accommodative intraocular lenses: paraxial optics analysis. Ophthalmic Physiol Opt 2010; 31:7-16. [PMID: 21054469 DOI: 10.1111/j.1475-1313.2010.00795.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE Using an analytical approach of paraxial optics, we evaluated the magnification of a model eye implanted with single-element (1E) and dual-element (2E) translating-optics accommodative intraocular lenses (AIOL) with an objective of understanding key control parameters relevant to their design. Potential clinical implications of the results arising from pseudophakic accommodation were also considered. METHODS Lateral and angular magnifications in a pseudophakic model eye were analyzed using the matrix method of paraxial optics. The effects of key control parameters such as direction (forward or backward) and distance (0 to 2 mm) of translation, power combinations of the 2E-AIOL elements (front element power range +20.0 D to +40.0 D), and amplitudes of accommodation (0 to 4 D) were tested. Relative magnification, defined as the ratio of the retinal image size of the accommodated eye to that of unaccommodated phakic (rLM(1)) or pseudophakic (rLM(2)) model eyes, was computed to determine how retinal image size changes with pseudophakic accommodation. RESULTS Both lateral and angular magnifications increased with increased power of the front element in 2E-AIOL and amplitude of accommodation. For a 2E-AIOL with front element power of +35 D, rLM(1) and rLM(2) increased by 17.0% and 16.3%, respectively, per millimetre of forward translation of the element, compared to the magnification at distance focus (unaccommodated). These changes correspond to a change of 9.4% and 6.5% per dioptre of accommodation, respectively. Angular magnification also increased with pseudophakic accommodation. 1E-AIOLs produced consistently less magnification than 2E-AIOLs. Relative retinal image size decreased at a rate of 0.25% with each dioptre of accommodation in the phakic model eye. The position of the image space nodal point shifted away from the retina (towards the cornea) with both phakic and pseudophakic accommodation. CONCLUSION Power of the mobile element, and amount and direction of the translation (or the achieved accommodative amplitude) are important parameters in determining the magnifications of the AIOLs. The results highlight the need for caution in the prescribing of AIOL. Aniso-accommodation or inter-ocular differences in AIOL designs (or relative to the natural lens of the contralateral eye) may introduce dynamic aniseikonia and consequent impaired binocular vision. Nevertheless, some designs, offering greater increases in magnification on accommodation, may provide enhanced near vision depending on patient needs.
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Affiliation(s)
- Jit B Ale
- Vision Cooperative Research Centre, Sydney, Australia Brien Holden Vision Institute, Sydney, Australia.
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Solomon JD. Outcomes of Corneal Spherical Aberration-Guided Cataract Surgery Measured by the OPD-Scan. J Refract Surg 2010; 26:863-9. [DOI: 10.3928/1081597x-20100129-01] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Accepted: 11/11/2009] [Indexed: 11/20/2022]
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Maxwell AW, Lane SS, Zhou F. Reply : Comparing pupil-dependent image quality across presbyopia-correcting intraocular lenses. J Cataract Refract Surg 2010. [DOI: 10.1016/j.jcrs.2010.04.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pepose JS, Altmann GE. Comparing pupil-dependent image quality across presbyopia-correcting intraocular lenses. J Cataract Refract Surg 2010; 36:1060-2; author reply 1062-3. [DOI: 10.1016/j.jcrs.2010.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Indexed: 11/25/2022]
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Wang L, Pitcher JD, Weikert MP, Koch DD. Custom selection of aspheric intraocular lenses after wavefront-guided myopic photorefractive keratectomy. J Cataract Refract Surg 2010; 36:73-81. [DOI: 10.1016/j.jcrs.2009.07.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Revised: 07/30/2009] [Accepted: 07/31/2009] [Indexed: 11/26/2022]
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Customized aspheric intraocular lenses calculated with real ray tracing. J Cataract Refract Surg 2009; 35:1984-94. [DOI: 10.1016/j.jcrs.2009.05.053] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Revised: 05/25/2009] [Accepted: 05/26/2009] [Indexed: 11/20/2022]
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Li J, Xiong Y, Wang N, Li S, Dai Y, Xue L, Zhao H, Jiang W, Zhang Y. Effects of spherical aberration on visual acuity at different contrasts. J Cataract Refract Surg 2009; 35:1389-95. [PMID: 19631126 DOI: 10.1016/j.jcrs.2009.03.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 03/04/2009] [Accepted: 03/18/2009] [Indexed: 10/20/2022]
Abstract
PURPOSE To evaluate the effect of spherical aberration on visual acuity by correcting and inducing spherical aberration using an adaptive optics vision simulator. SETTING Laboratory of Vision Science, Capital Medical University, Beijing, and Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China. METHODS An adaptive optics vision simulator comprising a wavefront sensor and a 37-segmented deformable mirror was used to correct and induce aberrations of the eye. The effective ocular wavefront aberration was manipulated with the deformable mirror, as the resulting visual performance was simultaneously measured. Subjective visual acuity measurements were performed with a 6.0 mm pupil. Visual acuity at different contrasts was measured when spherical aberration was fully corrected and the other natural aberrations in the eye were present and when spherical aberration values were induced with the other aberrations corrected. RESULTS The natural root-mean-square (RMS) value of spherical aberration in the 8 subjects examined was between -0.11 microm and 0.14 microm. There was no significant improvement in visual acuity with spherical aberration corrected and the subjects' natural aberrations present. When all aberrations were corrected, a decrease in visual acuity occurred when spherical aberration RMS was induced at 0.2 microm and 0.3 microm. CONCLUSIONS When fluctuation of other natural aberrations in the eye were present, there was a slight effect on visual acuity when the spherical aberration RMS was approximately 0.1 microm. Therefore, an RMS value of 0.1 microm could be an acceptable amount of spherical aberration when correcting spherical aberrations.
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Affiliation(s)
- Jing Li
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
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Yamaguchi T, Negishi K, Ono T, Torii H, Dogru M, Yamaguchi K, Ohnuma K, Tsubota K. Feasibility of spherical aberration correction with aspheric intraocular lenses in cataract surgery based on individual pupil diameter. J Cataract Refract Surg 2009; 35:1725-33. [DOI: 10.1016/j.jcrs.2009.05.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Revised: 05/02/2009] [Accepted: 05/05/2009] [Indexed: 10/20/2022]
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Trueb PR, Albach C, Montés-Micó R, Ferrer-Blasco T. Visual acuity and contrast sensitivity in eyes implanted with aspheric and spherical intraocular lenses. Ophthalmology 2009; 116:890-5. [PMID: 19410947 DOI: 10.1016/j.ophtha.2008.12.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Revised: 11/26/2008] [Accepted: 12/02/2008] [Indexed: 10/20/2022] Open
Abstract
PURPOSE To compare visual acuity and contrast sensitivity (CS) in eyes implanted with aspheric and spherical intraocular lenses (IOLs) after cataract surgery. DESIGN Randomized, prospective study. PARTICIPANTS Five hundred twenty-four eyes from 262 cataract surgery patients implanted with 2 IOL models: the AcrySof IQ (262 eyes) and AcrySof SN60AT (262 eyes; Alcon Laboratories, Fort Worth, TX). METHODS High-contrast photopic best-corrected distance visual acuity (BCVA) and CS under photopic (85 cd/m(2)) and mesopic (6 cd/m(2)) conditions were measured. Pupil diameter was analyzed for distance vision under both lighting conditions. Follow-up was carried out for 6 months in all patients. MAIN OUTCOMES MEASURES Best-corrected distance visual acuity and photopic and mesopic CS after implantation under monocular and binocular conditions. RESULTS No statistically significant differences in BCVA were found between either IOL (0.06+/-0.06 and 0.05+/-0.07 logarithm of the minimum angle of resolution units for AcrySof SN60AT and AcrySof IQ groups, respectively; P = 0.091). One hundred percent of patients achieved BCVA of 20/32 or better in both groups. The percentage of patients who achieved BCVA of 20/25 or better was 86.3%. The AcrySof IQ IOL group showed better monocular and binocular CS at 6, 12, and 18 cpd under photopic conditions and at 3, 6, 12, and 18 cpd under mesopic conditions (P<0.001). CONCLUSIONS Eyes implanted with the aspheric AcrySof IQ IOL showed better photopic and mesopic CS at medium and high spatial frequencies than eyes implanted with the spherical AcrySof SN60AT IOL. High-contrast photopic BCVA was similar between both IOLs. FINANCIAL DISCLOSURE(S) The author(s) have no proprietary or commercial interest in any materials discussed in this article.
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Affiliation(s)
- Peter R Trueb
- Ambulante Augenchirurgie Zürich, Talstrasse 65, Zürich, Switzerland.
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Fiala W. Remarks on WaveFront Designed Aberration Correcting Intraocular Lenses. Optom Vis Sci 2009; 86:529-36. [DOI: 10.1097/opx.0b013e31819fa221] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Ferrer-Blasco T. Effect of partial and full correction of corneal spherical aberration on visual acuity and contrast sensitivity. J Cataract Refract Surg 2009; 35:949-51. [PMID: 19393900 DOI: 10.1016/j.jcrs.2008.12.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2008] [Revised: 12/07/2008] [Accepted: 12/08/2008] [Indexed: 11/17/2022]
Abstract
A 60-year-old white man had cataract surgery with an AcrySof IQ intraocular lens (IOL) implanted in the right eye and a Tecnis IOL implanted in the left eye. The ocular spherical aberration (SA) target for a 6.0 mm pupil was +0.10 microm for the right eye and 0 microm for the left eye. After surgery, the ocular SA in the right eye was significantly higher than that in the left eye (+0.112 microm +/- 0.002 [SD] versus +0.021 +/- 0.003 microm; P<.001). No between-eye difference in the best corrected visual acuity and photopic contrast sensitivity was found. The contrast sensitivity was significantly better in the eye with the AcrySof IQ IOL at 12 and 18 cpd under mesopic conditions. The best contrast sensitivity was achieved in the eye with a residual ocular SA of about +0.10 microm.
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Nanavaty MA, Spalton DJ, Boyce J, Saha S, Marshall J. Wavefront aberrations, depth of focus, and contrast sensitivity with aspheric and spherical intraocular lenses: Fellow-eye study. J Cataract Refract Surg 2009; 35:663-71. [DOI: 10.1016/j.jcrs.2008.12.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2008] [Revised: 12/03/2008] [Accepted: 12/04/2008] [Indexed: 10/21/2022]
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Comparison of contrast sensitivity, depth of field and ocular wavefront aberrations in eyes with an IOL with zero versus positive spherical aberration. Graefes Arch Clin Exp Ophthalmol 2009; 247:965-73. [PMID: 19277694 DOI: 10.1007/s00417-009-1038-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2008] [Revised: 01/07/2009] [Accepted: 01/12/2009] [Indexed: 10/21/2022] Open
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Analysis of the possible benefits of aspheric intraocular lenses: Review of the literature. J Cataract Refract Surg 2009; 35:172-81. [PMID: 19101441 DOI: 10.1016/j.jcrs.2008.09.017] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 08/09/2008] [Accepted: 09/06/2008] [Indexed: 11/23/2022]
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Yamaguchi T, Dogru M, Yamaguchi K, Ono T, Saiki M, Okuyama H, Tsubota K, Negishi K. Effect of spherical aberration on visual function under photopic and mesopic conditions after cataract surgery. J Cataract Refract Surg 2009; 35:57-63. [DOI: 10.1016/j.jcrs.2008.09.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Revised: 09/21/2008] [Accepted: 09/21/2008] [Indexed: 11/29/2022]
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Current world literature. Curr Opin Ophthalmol 2008; 20:69-72. [PMID: 19077831 DOI: 10.1097/icu.0b013e32831fd89f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hong X, Zhang X. Optimizing distance image quality of an aspheric multifocal intraocular lens using a comprehensive statistical design approach. OPTICS EXPRESS 2008; 16:20920-20934. [PMID: 19065231 DOI: 10.1364/oe.16.020920] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The AcrySof ReSTOR intraocular lens (IOL) is a multifocal lens with state-of-the-art apodized diffractive technology, and is indicated for visual correction of aphakia secondary to removal of cataractous lenses in adult patients with/without presbyopia, who desire near, intermediate, and distance vision with increased spectacle independence. The multifocal design results in some optical contrast reduction, which may be improved by reducing spherical aberration. A novel patent-pending approach was undertaken to investigate the optical performance of aspheric lens designs. Simulated eyes using human normal distributions were corrected with different lens designs in a Monte Carlo simulation that allowed for variability in multiple surgical parameters (e.g. positioning error, biometric variation). Monte Carlo optimized results indicated that a lens spherical aberration of -0.10 microm provided optimal distance image quality.
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Affiliation(s)
- Xin Hong
- Alcon Laboratories, Inc. 6201 South Freeway, Fort Worth, Texas 76134, USA.
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Effect of 3rd-order aberrations on human vision. J Cataract Refract Surg 2008; 34:1339-44. [DOI: 10.1016/j.jcrs.2008.04.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Accepted: 04/13/2008] [Indexed: 11/19/2022]
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