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Lin X, Ma D, Yang J. Insights into the rotational stability of toric intraocular lens implantation: diagnostic approaches, influencing factors and intervention strategies. Front Med (Lausanne) 2024; 11:1349496. [PMID: 38414624 PMCID: PMC10896894 DOI: 10.3389/fmed.2024.1349496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 01/30/2024] [Indexed: 02/29/2024] Open
Abstract
Toric intraocular lenses (IOLs) have been developed to enhance visual acuity impaired by cataracts and correct corneal astigmatism. However, residual astigmatism caused by postoperative rotation of the toric IOL is an important factor affecting visual quality after implantation. To decrease the rotation of the toric IOL, significant advancements have been made in understanding the characteristics of toric IOL rotation, the factors influencing its postoperative rotation, as well as the development of various measurement techniques and interventions to address this issue. It has been established that factors such as the patient's preoperative refractive status, biological parameters, surgical techniques, postoperative care, and long-term management significantly impact the rotational stability of the toric IOL. Clinicians should adopt a personalized approach that considers these factors to minimize the risk of toric IOL rotation and ensure optimal outcomes for each patient. This article reviews the influence of various factors on toric IOL rotational stability. It discusses new challenges that may be encountered to reduce and intervene with rotation after toric IOL implantation in the foreseeable future.
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Affiliation(s)
- Xuanqiao Lin
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- Key NHC Laboratory of Myopia, Fudan University, and Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- Eye Hospital and School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, China
| | - Dongmei Ma
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- Key NHC Laboratory of Myopia, Fudan University, and Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Jin Yang
- Eye Institute and Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China
- Key NHC Laboratory of Myopia, Fudan University, and Laboratory of Myopia, Chinese Academy of Medical Sciences, Shanghai, China
- Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
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Jiang Y, Gao Y, Yang J, Chen X, Zhao F, Li M, Lin S, Bu S, Tian F. Comparison of two objective methods for measuring postoperative toric intraocular lens orientation under the natural pupil. J Cataract Refract Surg 2023; 49:1223-1228. [PMID: 37616186 DOI: 10.1097/j.jcrs.0000000000001295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 08/19/2023] [Indexed: 08/26/2023]
Abstract
PURPOSE To evaluate and compare the accuracy of iTrace and CASIA2 in measuring the postoperative orientation of toric intraocular lens (IOL) without mydriasis. SETTING Tianjin Medical University Eye Hospital, Tianjin, China. DESIGN Prospective cohort study. METHODS Patients with SN6AT toric IOLs implanted after cataract surgery were enrolled. 1 month after surgery, the toric IOL orientation were measured by iTrace and CASIA2 in non-mydriatic, semi-dark conditions. Then, the toric axis was directly reviewed using the slit-lamp under full mydriasis. Axis measurement differences between each of the 2 devices and the slit-lamp, described as their relative differences (RDs), were calculated and compared. The percentage of RDs within 5 degrees, within 10 degrees and greater than 30 degrees were analyzed. RESULTS 77 eyes of 70 patients were included. Generally, the mean toric axis measurement RDs of CASIA2 and iTrace were 9.24 ± 10.53 degrees and 13.89 ± 15.47 degrees respectively ( P = .04). For CASIA2 (72 eyes), 54.17% (39), 72.22% (52), and 4.17% (3) of eyes had RDs within 5 degrees, within 10 degrees and greater than 30 degrees, compared with 40.00% (28), 61.43% (43) and 12.86% (9) for iTrace (70 eyes). The 95% limits of agreements of CASIA2 with slit-lamp was narrower than that of iTrace with slit-lamp. The median RD of CASIA2 was significantly smaller in eyes with pupil ≥4 mm under dark condition compared with eyes with pupil <4 mm ( P = .03). CONCLUSIONS CASIA2 demonstrates greater precision in measuring toric IOL orientation under non-mydriatic conditions compared with iTrace. Moreover, the accuracy of CASIA2 is enhanced in cases of pupil >4 mm.
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Affiliation(s)
- Yuanfeng Jiang
- From the Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Nankai District, Tianjin, China
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Oshika T, Nakano S, Inamura M, Ikai N, Kato Y, Izumi I, Shimokawabe K. Extensive misalignment of plate-haptic rotationally asymmetric multifocal toric intraocular lens. Jpn J Ophthalmol 2023; 67:560-564. [PMID: 37289297 DOI: 10.1007/s10384-023-01001-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 04/26/2023] [Indexed: 06/09/2023]
Abstract
PURPOSE Plate-haptic rotationally asymmetric multifocal toric intraocular lenses (IOL) (Lentis Comfort Toric) occasionally rotate extensively after surgery. We conducted the current study to investigate the incidence of extensive misalignment of this IOL and its association with clinical parameters. STUDY DESIGN Retrospective case series. SUBJECTS AND METHODS Data were collected from patients who had undergone phacoemulsification and implantation of a plate-haptic multifocal toric IOL. RESULTS Among 332 eyes, extensive misalignment of toric IOLs ≥ 45º occurred in 3.3% (11 eyes). The amount of misalignment in eyes with extensive misalignment was 81.6 ± 22.9º, while in those without extensive misalignment, it was 3.0 ± 2.7º. The eyes with extensive misalignment showed significantly greater axial length (p < 0.001), larger corneal diameter (p = 0.034), and flatter corneas (p = 0.044) than those without extensive misalignment. Repositioning surgery to correct toric IOL misorientation was conducted in 9 eyes between 7 and 28 days after cataract surgery. In 2 eyes, repositioning surgery was carried out twice. CONCLUSIONS In majority of cases plate-haptic multifocal toric IOLs showed satisfactory rotational stability, but extensive misalignment ≥ 45º occurred in 3.3% of cases.
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Affiliation(s)
- Tetsuro Oshika
- Department of Ophthalmology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8575, Japan.
| | - Shinichiro Nakano
- Division of Ophthalmology, Ryugaski Saiseikai Hospital, Ryugasaki, Ibaraki, Japan
| | | | - Nakako Ikai
- Inamura Eye Clinic, Yokoham, Kanagawa, Japan
| | - Yuji Kato
- Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan
| | - Iori Izumi
- Department of Ophthalmology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8575, Japan
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Prasad RS, Sankarananthan R, Pai A, Kamble NR, Balakrishnan L, Chitradevi R, Shekhar M. Outcomes of toric intraocular lens realignment surgery done using slit-lamp method and wavefront aberrometry method. Indian J Ophthalmol 2023; 71:2978-2983. [PMID: 37530268 PMCID: PMC10538824 DOI: 10.4103/ijo.ijo_37_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023] Open
Abstract
Purpose To compare the slit-lamp method and wavefront aberrometry method based on outcomes of toric realignment surgeries. Settings Tertiary care ophthalmic hospital. Design Retrospective study. Methods This study included all eyes undergoing toric intraocular lens (TIOL) realignment surgery between January 2019 and December 2021 for which TIOL axis assessment by slit-lamp method and wavefront aberrometry method was available. Data were retrieved from electronic medical records, and we documented demographics, uncorrected visual acuity (UCVA), subjective refraction, and TIOL axis by slit-lamp and wavefront aberrometry methods on postoperative day 1 and day 14. In patients with misalignment, TIOL was realigned to the original position in group 1 (27 patients) and to an axis based on calculations provided by wavefront aberrometer in group 2 (25 patients). Post-realignment surgery, UCVA, subjective refraction, and TIOL axis by slit-lamp and wavefront aberrometry methods were assessed and analyzed. Results We analyzed 52 eyes and found that the mean preoperative misalignment with the slit-lamp method (44.9° ±20.0°) and wavefront aberrometry (47.1° ±19.5°) was similar. The corresponding degrees of misalignment post-TIOL repositioning surgeries were 5.2° ±5.2° (slit-lamp method) and 4.7° ±5.1° (wavefront aberrometry) (P = 0.615). Both groups showed significant improvement in median log of minimum angle of resolution (logMAR) UCVA and reduction in median refractive cylinder. Conclusions Slit-lamp method is as good as wavefront aberrometer method to assess TIOL axis. Toric realignment surgery is found to be safe, and realigning TIOL based on either slit-lamp method or wavefront aberrometer method equally improved UCVA and decreased residual refractive cylinder.
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Affiliation(s)
- R Senthil Prasad
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
| | - R Sankarananthan
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
| | - Aruna Pai
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
| | - Nikhil R Kamble
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
| | - Logesh Balakrishnan
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
| | - R Chitradevi
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
| | - Madhu Shekhar
- Cataract and IOL Services, Aravind Eye Hospital and Post Graduate Institue of Ophthalmology, Madurai, Tamil Nadu, India
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Zeilinger J, Hienert J, Ruiss M, Pilwachs C, Findl O. Rotational stability of a new toric intraocular lens with an advanced optical profile. J Cataract Refract Surg 2023; 49:584-588. [PMID: 36745852 DOI: 10.1097/j.jcrs.0000000000001158] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 01/30/2023] [Indexed: 02/08/2023]
Abstract
PURPOSE To examine the rotational stability of a new toric intraocular lens (IOL), the TECNIS Eyhance Toric II, over a course of 3 months. SETTING Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria. DESIGN Prospective unmasked single-center study. METHODS 50 eyes of 50 patients with cataract and regular corneal astigmatism ≥0.75 diopters (D) were included. The TECNIS Eyhance Toric II IOL was implanted in 1 eye of each study patient. Images of the alignment axis of the IOL were taken intraoperatively, as well as at 1 hour, 1 week, and 3 months postoperatively. For the measurement of toric IOL rotation, images were superimposed on the basis of ocular landmarks. Uncorrected and corrected distance (4 m) and intermediate (66 cm) visual acuities were assessed at the 3-month visit. RESULTS There was no significant difference in the rotational position between the intraoperative and 3 month timepoints, with a mean rotation of 1.34 ± 1.46 degrees, in 27 examined eyes. ( P = 0.313). No patients had to undergo repositioning of the toric IOL. A significant reduction of refractive cylinder occurred from preoperatively 1.8 ± 1.1 to 0.40 ± 0.42 D at the 3-month visit ( P = .001; n = 43). The corrected distance visual acuity improved significantly from 0.28 ± 0.16 logMAR preoperatively to -0.01 ± 0.13 logMAR at 3 months postoperatively ( P = .001; n = 43). CONCLUSIONS The TECNIS Eyhance Toric II showed a good visual performance with no significant rotation over a course of 3 months and, therefore, an excellent rotational stability. The intraocular lens showed a good safety profile with no adverse events.
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Affiliation(s)
- Johannes Zeilinger
- From the Vienna Institute for Research in Ocular Surgery (VIROS), A Karl Landsteiner Institute, Hanusch Hospital, Vienna, Austria
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Osawa R, Sano M, Yuguchi T, Kaiya T, Oshika T. Effects of Modified Haptics on Surgical Outcomes and Rotational Stability of Toric Intraocular Lens Implantation. J Refract Surg 2022; 38:648-653. [PMID: 36214346 DOI: 10.3928/1081597x-20220715-02] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
PURPOSE To assess the rotational stability of a new toric intraocular lens (IOL), TECNIS toric II (toric II), which is a modified version of the TECNIS toric IOL (toric I) with frosted haptics (Johnson & Johnson). METHODS A total of 101 eyes of 101 patients who had been treated with phacoemulsification and toric IOL implantation were included. Before and 1 day, 1 week, and 1 month after surgery, uncorrected (UDVA) and corrected (CDVA) distance visual acuity were measured. Preoperative corneal astigmatism and postoperative manifest refractive astigmatism at 1 day and 1 month were analyzed. At 1 day and 1 month postoperatively, the amount of IOL axis misalignment from the intended orientation, tilt, and decentration were measured using anterior segment optical coherence tomography. RESULTS Fifty-one eyes received the toric I IOL and 50 eyes received the toric II IOL. Toric I IOLs showed a significantly larger amount of axis misalignment than toric II IOLs at both 1 day (9.6 ± 7.6° vs 5.4 ± 4.8°, P = .003) and 1 month (9.1 ± 7.8° vs. 4.7 ± 4.2°, P = .003) postoperatively.The proportion of eyes with misalignment greater than 10° was significantly larger with toric I than toric II IOLs (P < .001). There were no significant differences between IOLs in the amount of residual astigmatism, UDVA, CDVA, and amount of tilt and decentration at 1 day and 1 month postoperatively. CONCLUSIONS The TECNIS toric II IOL with frosted haptics has significantly improved rotational stability compared to its previous model. [J Refract Surg. 2022;38(10):648-653.].
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Pellegrini M, Furiosi L, Yu AC, Giannaccare G, Scuteri G, Gardeli I, Busin M, Bovone C, Spena R. Outcomes of cataract surgery with toric intraocular lens implantation after keratoplasty. J Cataract Refract Surg 2022; 48:157-161. [PMID: 34174044 DOI: 10.1097/j.jcrs.0000000000000730] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 06/16/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE To evaluate the efficacy and predictability of cataract extraction with toric intraocular lens (IOL) implantation after deep anterior lamellar keratoplasty (DALK) or mushroom penetrating keratoplasty (PK). SETTING Villa Igea Hospital, Forlì, Italy. DESIGN Prospective case series. METHODS Toric IOL implantation was offered to patients with cataract, corneal astigmatism >1.5 diopters (D) and regular central corneal topography after complete suture removal. Phacoemulsification was performed through a 2.4 mm scleral tunnel and an enVista monofocal toric MX60T or Eyecryl monofocal toric IOL was inserted in the capsular bag. Main outcome measures were uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction, total prediction error, and IOL misalignment. RESULTS 37 consecutive patients who had previously undergone either DALK (n = 27, 73%) or 2-piece mushroom PK (n = 10, 27%) were included. All patients completed the 6-month follow-up. The mean toric IOL power was 5.3 ± 1.1 D. Both UDVA and CDVA significantly improved (from 1.02 ± 0.27 to 0.46 ± 0.31 logMAR and from 0.65 ± 0.27 to 0.11 ± 0.12 logMAR, respectively; P < .001). 20 eyes (54%) reached UDVA ≥20/40, whereas 35 eyes (95%) reached a CDVA ≥20/40. Final refractive astigmatism was 0.93 ± 0.87 D, with 35 eyes (95%) within 2 D. Prediction error was ≤1 D in 18 eyes (49%). Absolute IOL misalignment was 3.3 ± 3.5 degrees. CONCLUSIONS Toric IOL implantation in postkeratoplasty eyes allowed reduction of refractive astigmatism to predictably low levels with concomitant improved visual outcomes.
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Affiliation(s)
- Marco Pellegrini
- From the Department of Translational Medicine, University of Ferrara, Ferrara, Italy (Pellegrini, Furiosi, Yu, Gardeli, Busin, Bovone, Spena); Department of Ophthalmology, Ospedali Privati Forlì "Villa Igea," Forlì, Italy (Pellegrini, Furiosi, Yu, Gardeli, Busin, Bovone, Spena); Istituto Internazionale per la Ricerca e Formazione in Oftalmologia (IRFO), Forlì, Italy (Pellegrini, Furiosi, Yu, Busin, Bovone, Spena); Department of Ophthalmology, Magna Graecia University of Catanzaro, Catanzaro, Italy (Giannaccare, Scuteri); General Hospital of Athens "G. Gennimatas," Athens, Greece (Gardeli)
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Influence of frosted haptics on rotational stability of toric intraocular lenses. Sci Rep 2021; 11:15099. [PMID: 34302005 PMCID: PMC8302686 DOI: 10.1038/s41598-021-94293-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 07/01/2021] [Indexed: 11/24/2022] Open
Abstract
We investigated the unfolding property and rotational stability of a new toric intraocular lens (IOL); TECNIS toric II (toric-II, ZCW, Johnson & Johnson) that is an improved version of TECNIS toric IOL (toric-I, ZCV). Both IOLs are based on an identical platform, except for the frosted haptics with toric-II IOL. The study consisted of two parts; experimental study and clinical, retrospective, case series. Experimental study indicated that the overall time from IOL ejection to unfolding to 11 mm was significantly shorter with toricII than toric-I IOLs (p = 0.032), due to the earlier separation of the haptics from the optic with toric-II IOL. Clinical study included 131 eyes of 99 patients who had undergone phacoemulsification and toric IOL implantation. At 3 months postoperatively, toric-II IOL showed significantly better rotational stability than toric-I IOL, including smaller residual manifest astigmatism (p = 0.018), less amount of axis misalignment from the intended axis (p = 0.04), lower incidence of misalignment > 10º (p = 0.0044), and less degree of prediction errors (p = 0.043). Postoperative uncorrected distance visual acuity tended to be better in the toric-II than in the toric-I groups, with marginal statistical difference (p = 0.057). TECNIS toric II IOL with the frosted haptics showed significantly better rotational stability than its predecessor, probably due to quicker unfolding and greater friction with the capsular bag.
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Abstract
We evaluated the rotational stability of a new toric intraocular lens (IOL), HOYA XY-1 toric IOL that is an improved version of HOYA 355 toric IOL, with longer overall length (13.0 mm vs. 12.5 mm), shortened unfolding time, and texture processing of the surface of haptics. Data from 193 eyes of 165 patients (76.4 ± 8.3 years old) with preoperative corneal astigmatism exceeding 0.75 diopters who had undergone phacoemulsification and toric IOL implantation were collected and analyzed. Corneal astigmatism, refractive astigmatism, and uncorrected (UDVA) and corrected distance visual acuity (CDVA) were evaluated before and 1 day, 1 week, and 1 month after surgery. The degree of IOL decentration, IOL tilt, and toric axis misalignment was assessed at 1 day and 1 month postoperatively. Fifty eyes received AcrySof toric IOL, 51 eyes TECNIS toric IOL, 46 eyes HOYA 355 toric IOL, and 46 eyes HOYA XY-1 toric IOL. The amount of axis misalignment from the intended axis was significantly different among IOLs (p = 0.004, one-way ANOVA), and HOYA XY-1 showed significantly less amount of axis misalignment than TECNIS (p = 0.020, Tukey’s multiple comparison) and HOYA 355 (p = 0.010). The proportion of eyes that showed axis misalignment <10° at 1 month postoperatively was significantly higher with HOYA XY-1 toric IOL than with other toric IOLs (χ2 test, p = 0.020). HOYA XY-1 toric IOL, the modified version of HOYA 355 toric IOL, showed excellent rotational stability in comparison with other models of toric IOLs.
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Pujari A, Yadav S, Mukhija R, Urkude J, Sharma N. Smartphone-aided technique to quantify toric intraocular lens alignment. J Cataract Refract Surg 2019; 45:1833-1834. [DOI: 10.1016/j.jcrs.2019.09.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 06/07/2019] [Accepted: 09/04/2019] [Indexed: 10/25/2022]
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Pujari A, Urkude J, Singh R, Yadav S, Mukhija R, Sharma N. Slitlamp protractor: Refinement of existing slitlamp toric scale. J Cataract Refract Surg 2019; 45:1515. [PMID: 31564325 DOI: 10.1016/j.jcrs.2019.05.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 05/20/2019] [Indexed: 11/29/2022]
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Ribeiro FJ, Ferreira TB, Relha C, Esteves C, Gaspar S. Predictability of different calculators in the minimization of postoperative astigmatism after implantation of a toric intraocular lens. Clin Ophthalmol 2019; 13:1649-1656. [PMID: 31695316 PMCID: PMC6718254 DOI: 10.2147/opth.s213132] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 08/01/2019] [Indexed: 01/18/2023] Open
Abstract
Purpose To assess the efficacy of five calculators for toric intraocular lenses (IOL). Methods Retrospective comparative case series in cataract patients undergoing implantation of trifocal toric IOLs (PhysIOL FineVision POD FT). Inclusion criteria were age-related cataract and a corneal astigmatism between 0.90D and 4.50D. Refractive astigmatism predictability of five different toric calculators or calculation methods were compared. Furthermore, two groups were differentiated according to the type of astigmatism. The mean absolute error and the centroid errors in the predicted residual astigmatism from each calculator were evaluated. Results Fifty-one eyes of 43 patients were included in the study. For the standard toric calculator using anterior keratometry values only, the centroid prediction error was 0.39D±0.41@166º, which was reduced by the application of the PhysIOL toric calculator that includes the Abulafia-Koch regression formula and adjustment for the effective lens position (0.05D±0.34@167º), and also by the application of the Barrett toric calculator (0.07D±0.28@160º). Regarding the techniques that directly evaluate posterior corneal surface, the Holladay toric calculator, using total corneal power provided by a color-LED topographer, generated better results (0.10D±0.44@156º) than those using Scheimpflug camera data (0.23D±0.56@158º). Similar results were found for both types of astigmatism. Conclusion The PhysIOL and the Barrett toric calculators taking into account the posterior corneal astigmatism by mathematical models, yielded lower astigmatic prediction errors compared to a standard toric calculator based on anterior keratometry data only. When total corneal power measurements were used, prediction errors were lower with color-LED than with Scheimpflug based topography.
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Affiliation(s)
- Filomena J Ribeiro
- Ophthalmology Department, Luz Hospital, Lisbon, Portugal.,Faculdade De Medicina Da Universidade De Lisboa, Lisbon, Portugal
| | - Tiago B Ferreira
- Ophthalmology Department, Luz Hospital, Lisbon, Portugal.,NOVA Medical School, Lisbon, Portugal
| | - Catarina Relha
- Ophthalmology Department, Luz Hospital, Lisbon, Portugal
| | - Carina Esteves
- Ophthalmology Department, Luz Hospital, Lisbon, Portugal
| | - Sylvia Gaspar
- Ophthalmology Department, Luz Hospital, Lisbon, Portugal
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Ang M, Baskaran M, Werkmeister RM, Chua J, Schmidl D, Aranha dos Santos V, Garhöfer G, Mehta JS, Schmetterer L. Anterior segment optical coherence tomography. Prog Retin Eye Res 2018; 66:132-156. [DOI: 10.1016/j.preteyeres.2018.04.002] [Citation(s) in RCA: 216] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 02/20/2018] [Accepted: 04/04/2018] [Indexed: 02/03/2023]
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Prediction of pupil size under binocular open-view settings using the new CASIA2 device. Int Ophthalmol 2018; 39:791-796. [DOI: 10.1007/s10792-018-0879-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 02/21/2018] [Indexed: 10/17/2022]
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