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Icoz M, Yildirim B, Gurturk Icoz SG. Comparison of different methods of correcting astigmatism in cataract surgery. Clin Exp Optom 2024; 107:409-414. [PMID: 37699788 DOI: 10.1080/08164622.2023.2239816] [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: 05/08/2023] [Revised: 07/11/2023] [Accepted: 07/19/2023] [Indexed: 09/14/2023] Open
Abstract
CLINICAL RELEVANCE Astigmatism causes a decrement in visual acuity, and deterioration in visual quality. BACKGROUND The aim of this study is to compare clear corneal incision (CCI) in the steepest meridian, opposed clear corneal incision (OCCI) and toric intraocular lens implantation methods for the correction of astigmatism in cataract surgery. METHODS Total of 93 preoperative patients with the rule corneal astigmatism (between 1.00-3.00 D)underwent uncomplicated cataract surgery are retrospectively included in this study. Whole patients are divided into three groups of equal number of patients of 31 by considering the astigmatism correcting methods that are as follows. Group 1 consists of patients underwent CCI on the steepest meridian, group 2 consists of the patients underwent paired OCCI, and group 3 consists of those with toric intraocular lens implantation. The preoperative and postoperative 3rd month uncorrected distance visual acuity, refraction and, keratometry values, and surgically induced astigmatism values calculated by Alpins method are recorded. RESULTS The age, preoperative and postoperative 3rd month spherical, spherical equivalent refraction and keratometry values of the groups are similar (p > 0.05). The preoperative uncorrected distance visual acuity values are similar in whole groups, postoperative uncorrected distance visual acuity values are the highest in group 1, and lowest in group 3 (p = 0.85, p = 0.02, respectively). The preoperative and postoperative 3rd month mean cylinder refraction values are -1.86 D, -1.00 D in group 1, -1.77 D, -0.70 D in group 2, and -1.95 D, -0.40 D in group 3. There is a statistically significant difference among the groups (p = 0.01). The surgically induced astigmatism values are statistically different among the groups [it was 0.46 ± 0.21 in group 1, 0.91 ± 0.44 in group 2, 0.33 ± 0.18 in group 3 (p < 0.001, respectively)]. CONCLUSION This study indicated that; CCI, paired OCCI, and toric intraocular lens implantation should be preferred and performed for the steepest meridian in low D, middle D, and high D astigmatism patients, respectively. CCI can easily be applied for low to medium D without needing extra skills and tools. On the other hand, toric intraocular lens implantation is a better option for a high astigmatism with proper and accurate planning before the surgery.
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Affiliation(s)
- Mehmet Icoz
- Department of Ophthalmology, Yozgat City Hospital, Yozgat, Turkey
| | - Busra Yildirim
- Department of Ophthalmology, Besni State Hospital, Adıyaman, Turkey
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Lin M, Zhou H, Hu Z, Huang J, Lu F, Hu L. Comparison of small incision lenticule extraction and transepithelial photorefractive keratectomy in terms of visual quality in myopia patients. Acta Ophthalmol 2021; 99:e1289-e1296. [PMID: 33982437 DOI: 10.1111/aos.14823] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 01/24/2021] [Accepted: 02/08/2021] [Indexed: 11/29/2022]
Abstract
PURPOSE To comprehensively compare visual quality between small incision lenticule extraction (SMILE) and transepithelial photorefractive keratectomy (tPRK). METHODS Sixty-four eyes in the SMILE group and 42 eyes in the tPRK group were enrolled in this study. In both groups, visual acuity, manifest refraction, higher-order aberrations (HOAs), contrast sensitivity (CS) at four spatial frequencies (3, 6, 12, 18 c/d) under three conditions (photopic, low glare, high glare), the cut-off value of the modulation transfer function (MTFcut-off), the objective scatter index (OSI) and the Strehl ratio (SR) were measured preoperatively and 1, 3 and 6 months postoperatively. RESULTS At 6 months postoperatively, the SMILE and tPRK groups showed similar safety, efficacy and predictability. Additionally, MTFcut-off, SR and OSI exhibited comparable results. In contrast, the photopic area under the logarithm of the CS function (AULCSF) showed better outcomes in the tPRK group than in the SMILE group (SMILE versus tPRK: 1.21 ± 0.10 versus 1.25 ± 0.09, p = 0.014). Furthermore, the induced coma aberrations were larger in the SMILE group (SMILE versus tPRK: 0.10 ± 0.16 versus 0.06 ± 0.12, 95% CI [0.08, 0.31], p < 0.0001). CONCLUSIONS Both SMILE and tPRK obtained comparable visual quality at 6 months postoperatively, accompanied by better photopic CS and smaller induced coma aberrations with tPRK. Paying more attention to alignment or developing a centration technique would be beneficial for visual quality when performing SMILE.
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Affiliation(s)
- Meng Lin
- Wenzhou Medical University Eye Hospital Wenzhou China
| | | | - Zhongli Hu
- Zhuji People's Hospital of Zhejiang Province Zhuji China
| | - Jinhai Huang
- Wenzhou Medical University Eye Hospital Wenzhou China
| | - Fan Lu
- Wenzhou Medical University Wenzhou China
| | - Liang Hu
- Wenzhou Medical University Eye Hospital Wenzhou China
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Ryan DS, Sia RK, Rabin J, Rivers BA, Stutzman RD, Pasternak JF, Eaddy JB, Logan LA, Bower KS. Contrast Sensitivity After Wavefront-Guided and Wavefront-Optimized PRK and LASIK for Myopia and Myopic Astigmatism. J Refract Surg 2018; 34:590-596. [PMID: 30199562 DOI: 10.3928/1081597x-20180716-01] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/03/2018] [Indexed: 11/20/2022]
Abstract
PURPOSE To compare contrast sensitivity among participants undergoing wavefront-guided or wavefront-optimized photorefractive keratectomy (PRK) or LASIK for the treatment of myopia or myopic astigmatism 12 months after surgery. METHODS In a prospective, randomized clinical trial, 215 participants with myopia ranging from -0.50 to -7.25 diopters (D) and less than -3.50 D of manifest astigmatism electing to undergo either LASIK or PRK were randomized to receive wavefront-guided or wavefront-optimized treatment. Corrected Super Vision Test (Precision Vision, La Salle, IL) high contrast and small letter contrast sensitivity, uncorrected postoperative contrast sensitivity function, and uncorrected and corrected distance visual acuity were measured preoperatively and at 1, 3, 6, and 12 months postoperatively. RESULTS There was a significant difference within each of the four groups over time when measuring high contrast visual acuity (P < .001) and small letter contrast sensitivity (P < .001), with the most significant decrease occurring 1 month postoperatively. However, there were no significant differences when comparing the four groups for high contrast sensitivity (P = .22) or small letter contrast sensitivity (P = .06). The area under the logarithm of contrast sensitivity function did not differ significantly over time (P = .09) or between groups (P = .16). A pairwise comparison of preoperative to 12-month CDVA showed a significant improvement in all groups (P < .017). The change in CDVA was also significantly different between groups as determined by one-way analysis of variance (P = .003). CONCLUSIONS Wavefront-guided and wavefront-optimized PRK and LASIK procedures maintained high contrast, small letter contrast sensitivity, and contrast sensitivity function 12 months postoperatively. Although the recovery period for visual performance was longer for PRK versus LASIK, there was no significant difference in treatment type or treatment profile at 12 months postoperatively. [J Refract Surg. 2018;34(9):590-596.].
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Eliwa TF, Abdellatif MK, Hamza II. Effect of Limbal Relaxing Incisions on Corneal Aberrations. J Refract Surg 2016; 32:156-62. [PMID: 27027622 DOI: 10.3928/1081597x-20160121-02] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 12/03/2015] [Indexed: 11/20/2022]
Abstract
PURPOSE To study the effect of limbal relaxing incisions on corneal aberrations after phacoemulsification with aspheric intraocular lens (IOL) implantation. METHODS Forty-five eyes underwent microincision cataract surgery with on-axis phacoemulsification incision. These eyes were divided into two groups: limbal relaxing incision group (23 eyes) and control group (22 eyes). In the limbal relaxing incision group, a single limbal relaxing incision was performed on the steepest meridian of corneal topography and the degrees of arc were determined using the DONO-Donnenfeld nomogram. The eyes in the control group were operated on by microincision cataract surgery without limbal relaxing incision. Corneal topography and wavefront analysis over 6-mm pupil size were performed preoperatively and 1 month postoperatively in both groups. Target induced astigmatism vector, surgically induced astigmatism vector, difference vector, magnitude of error, flattening effect, and torque were analyzed using the Alpins vectorial method. RESULTS The limbal relaxing incision group showed significant reduction in topographic astigmatism by 51.87% of preoperative topographical astigmatism (P < .0001). The mean surgically induced astigmatism of limbal relaxing incision was 1.29 ± 0.71 diopters (D), which was close to the mean target induced astigmatism (1.33 ± 0.20 D), whereas the control group did not show a significant change in topographic astigmatism (0.17 ± 0.11 D; P = .73). Higher order aberrations of the cornea did not show significant change in either group except quatrefoil aberration, which significantly increased in the limbal relaxing incision group but not in the control group, with no significant difference between the two groups regarding corneal aberrations. CONCLUSIONS Limbal relaxing incision is an effective method in reducing corneal astigmatism with neutral effect on corneal aberrations.
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Eliwa TF, Elsamkary MA, Hamza I. Effect of biaxial versus coaxial microincision cataract surgery on optical quality of the cornea. Indian J Ophthalmol 2015; 63:487-90. [PMID: 26265637 PMCID: PMC4550979 DOI: 10.4103/0301-4738.162598] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Context: Visual function is determined by a combination of the cornea, which has a larger effect and internal aberrations generated by the intraocular lens and those induced by the surgery. These corneal refractive changes are related to the location and size of the corneal incision. The smaller the incision, the lower the aberrations and the better the optical quality. Aims: To compare the effect of uneventful coaxial versus biaxial microincision cataract surgery (MICS) on the corneal aberrations. Settings and Design: Retrospective interventional nonrandomized comparative case study comprised 40 eyes of 36 patients with primary senile cataract. Subjects and Methods: They were divided into two groups: Group I (20 eyes) had operated by biaxial MICS and Group II (20 eyes) had operated by coaxial MICS. Each group were assessed by corneal topography and wavefront analysis over 6 mm pupil size preoperatively and 1-month postoperatively. Statistical Analysis Used: Statistical analysis was performed using SPSS for Windows (version 17.0.1, SPSS, Inc.). The paired t-test was used to compare the mean values of corneal aberrations preoperatively and 1-month postoperatively in each group. Results: There was a significant increase in trefoil and quatrefoil in biaxial MICS (P = 0.063, 0.032 respectively) while other aberrations insignificantly changed. The coaxial MICS showed a significant increase in root mean square (RMS) of total high order aberrations (HOAs) (P = 0.02) and coma (0.028), but not the others. In comparison to each other, there was the insignificant difference as regards astigmatism, RMS of individual and total HOAs. Conclusions: Coaxial and biaxial MICS are neutral on corneal astigmatism and aberrations.
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Razmjoo H, Koosha N, Vaezi MH, Rahimi B, Peyman A. Corneal astigmatism change and wavefront aberration evaluation after cataract surgery: "Single" versus "paired opposite" clear corneal incisions. Adv Biomed Res 2014; 3:163. [PMID: 25221766 PMCID: PMC4162035 DOI: 10.4103/2277-9175.139126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 05/08/2013] [Indexed: 11/10/2022] Open
Abstract
Background: Correcting the pre-existing astigmatism is an optimal goal in cataract surgery. The aim of this study is to compare the astigmatic correcting effect of a single regular 3.2 mm clear corneal incision (CCI) with paired opposite CCI in cataract patients and effect of these incisions on optical aberrations using the wavefront quantitative analysis. Materials and Methods: This was a randomized controlled trial study undertaken in an ophthalmology referral center on 50 patients planned for cataract surgery who were randomized to either single 3.2 mm CCI or paired opposite CCI group. Post-operative evaluation was performed at 12 weeks and included refraction, keratometery, corneal topography and wavefront analysis. Corneal astigmatism and post-operative values were compared in two groups. Results: The mean pre-operative corneal astigmatism was 2.58 ± 1.03 D in the single incision group and 2.70 ± 0.94 D in the paired opposite incisions group. After 12 weeks of surgery, the corneal astigmatism was reached to 2.15 ± 0.82 D in single incision group and 1.63 ± 1.21 in the paired opposite incisions group. There was a statistically significant difference in two arms of treatment regarding to surgically induced astigmatism after 3 months. The mean post-operative total and higher order aberrations and values were not significantly different in two groups. Conclusion: The results of our study showed that paired opposite incisions is an effective procedure for reducing pre-existing corneal astigmatism in cataract surgery. Paired incisions did not show any beneficial effect regarding wavefront aberrations compared with conventional single incision method.
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Affiliation(s)
- Hasan Razmjoo
- Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Nima Koosha
- Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Hadi Vaezi
- Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Behrooz Rahimi
- Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Alireza Peyman
- Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran
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Akdemir MO, Kandemir B, Sayman IB, Selvi C, Kamil Dogan O. Comparison of contrast sensitivity and visual acuity between deep anterior lamellar keratoplasty and penetrating keratoplasty in patients with keratoconus. Int J Ophthalmol 2012; 5:737-41. [PMID: 23275910 DOI: 10.3980/j.issn.2222-3959.2012.06.16] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Accepted: 11/05/2012] [Indexed: 11/02/2022] Open
Abstract
AIM To evaluate postoperative visual acuity and contrast sensitivity results following deep anterior lamellar keratoplasty (DALK) and penetrating keratoplasty (PK) in patients with keratoconus (KC). METHODS All the patients' records with KC who had PK or DALK surgery between May 2010 and May 2011 were retrospectively reviewed. Sixty patients who underwent successful corneal transplantation for KC: 30 eyes underwent DALK and 30 eyes underwent PK were included in this study. Preoperative and postoperative mean logarithm of the minimum angle of resolution (logMAR) uncorrected visual acuity (UCVA), logMAR best spectacle-corrected visual acuity (BSCVA) and intraocular pressure (IOP) were evaluated. Contrast sensitivity tests (CS) were done preoperative and 2 months after all sutures had removed. All surgeries were performed under regional anesthesia (retrobulbar anesthesia) by 1 surgeon (B.K.) who was experienced in penetrating and lamellar keratoplasty techniques. RESULTS The mean age of the DALK group was 29.67±4.95 (range 18-40) years and the PK group was 28.7±3.53 (range 18-39) years. Preoperatively there was no significant difference in the logMAR UCVA, logMAR BSCVA and IOP between the DALK (1.281±0.56; 0.97±0.85; 12.07±2.12mmHg) and PK (1.34±0.21; 0.98±0.21; 13±2.12mmHg) groups. One-year after surgery there was no significant difference in the mean logMAR UCVA and IOP between the DALK (0.46±0.37; 11.73±2.1mmHg) and PK (0.38±0.21; 12±2.12mmHg) groups. The mean contrast sensitivity was evaluated by CC-100 Topcon LCD at 1.5, 2.52, 4.23, 7.10 and 11.91 cycles per degree (cs/deg) spatial frequencies before and 2 months after the all sutures had removed. CONCLUSION All patients with keratoconus in both DALK and PK groups performed good visual function postoperatively. The mean contrast sensitivity increased considerably at all spatial frequencies compared with preoperative levels in the DALK and PK groups. The mean post-operative evaluation of contrast sensitivity measurements was not significantly different between the two groups.
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Affiliation(s)
- Mehmet Orcun Akdemir
- Department of Ophthalmology, School of Medicine, Bulent Ecevit University, Zonguldak, Turkey
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Can İ, Bayhan HA, Çelik H, Ceran BB. Comparison of corneal aberrations after biaxial microincision and microcoaxial cataract surgeries: a prospective study. Curr Eye Res 2011; 37:18-24. [PMID: 22029714 DOI: 10.3109/02713683.2011.622851] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To compare the effects of biaxial microincision cataract surgery (B-MICS) and microcoaxial cataract surgery (C-MICS) techniques on corneal optical quality. MATERIALS AND METHODS In this prospective study, 40 eyes underwent B-MICS and 40 eyes C-MICS. Corneal aberrations were derived from conversion of the corneal elevation profile into corneal wavefront data with 6.0 mm aperture diameter using Zernike polynomials by corneal topography preoperatively and 1 month postoperatively. Both magnitude and axes of surgically induced corneal aberrations were calculated. RESULTS Mean final incision widths were 1.80 ± 0.09 mm and 1.89 ± 0.11 mm (p = 0.062) in B-MICS and C-MICS groups, respectively. There were no significant changes in total and higher order root mean square in both groups postoperatively. In B-MICS group, all aberration terms were similar, before and after surgery. However, vertical coma (p = 0.002), vertical trefoil (p < 0.001) and primary trefoil (p = 0.042) significantly increased postoperatively in the C-MICS group. Except surgically induced trefoil (p = 0.047), there was no significant difference in all surgically induced corneal aberrations between groups. The axes of the induced trefoil were found to be mostly related and close to the incision site in both groups which was more prominent in the C-MICS group. CONCLUSIONS Microincision cataract surgery techniques performed through sub-1.9 mm clear corneal incisions do not generally degrade optical quality of the cornea while only small amount of higher order aberrations seem to be induced with C-MICS technique.
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Affiliation(s)
- İzzet Can
- Eye Department, Bozok University Faculty of Medicine, Yozgat, Turkey.
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Alió JL, Elkady B, Ortiz D. Corneal Optical Quality Following Sub 1.8 mm Micro-Incision Cataract Surgery vs. 2.2 mm Mini-Incision Coaxial Phacoemulsification. Middle East Afr J Ophthalmol 2011; 17:94-9. [PMID: 20543945 PMCID: PMC2880382 DOI: 10.4103/0974-9233.61225] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Purpose: To study and compare the effects of the micro-incision cataract surgery (MICS-sub 1.8 mm) and miniincision coaxial phacoemulsification (2.2 mm) on the optical quality of the cornea characterized in terms of corneal aberrations. Materials and Methods: Fifty eyes underwent MICS and 50 mini-incision phacoemulsification, by the same surgeon. Both types of cataract surgery were performed using low ultrasound power and through a clear corneal incision, placed on the steepest corneal meridian ranging from 1.6 to 1.8 in MICS (Group I) and from 2.12 to 2.3 mm in mini-incision coaxial phacoemulsification (Group II). Seidel and Zernike aberration coefficients and RMS values were obtained for a 6-mm pupil preoperatively and one month after surgery. Results: The corneal astigmatism did not show statistically significant changes in either of the two groups: (MICS: –0.73 ± 0.63, –0.65 ± 0.53 D, P = 0.25), (mini-incision phacoemulsification; –1.21 ± 1.52, –1.00 ± 1.19 D, P = 0.12). The total RMS remained unchanged after MICS (1.77 ± 1.7, 1.65 ± 1.3 μm, P = 0.18) and mini-incision phacoemulsification (2.00 ± 1.87, 2.09 ± 1.8 μm, P = 0.41). Statistically significant changes were found for coma (P = 0.004) and higher-order aberrations (P < 0.001), showing MICS significantly less changes in cornea. Conclusions: Both MICS and mini-incision phacoemulsification do not degrade the optical quality of the cornea. Both surgeries do not induce a modification of the corneal astigmatism, even in the axis. It seems that 2 mm is the limit around which no optical changes are induced by cataract surgery in the human cornea.
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Affiliation(s)
- Jorge L Alió
- VISSUM, Instituto Oftalmologico de Alicante, Spain
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Leng C, Feiz V, Modjtahedi B, Moshirfar M. Comparison of simulated keratometric changes induced by custom and conventional laser in situ keratomileusis after myopic ablation: retrospective chart review. J Cataract Refract Surg 2010; 36:1550-5. [PMID: 20692569 DOI: 10.1016/j.jcrs.2010.04.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 03/31/2010] [Accepted: 04/01/2010] [Indexed: 11/30/2022]
Abstract
PURPOSE To determine the relationship between the achieved refractive change and the change in simulated keratometry (K) after myopic laser situ keratomileusis (LASIK) and compare this relationship between custom and conventional treatments. SETTING Department of Ophthalmology, University of California, Davis, Sacramento, California, and John A. Moran Eye Center, Salt Lake City, Utah, USA. METHODS The change in simulated K and the refractive change induced by custom myopic LASIK and conventional LASIK were determined. The relationship between the variables was analyzed by regression methods. RESULTS Custom treatment was performed in 106 eyes and conventional treatment in 224 eyes. Simple linear regression analysis did not fit the clinical observation when the refractive change was less than 2.00 diopters (D) of myopic correction with both treatments. Under the linear model and nonlinear model, each unit of refractive change yielded a greater change in corneal topographic power with custom treatment than with conventional treatment. With both treatments, the rate of change in simulated K was not constant and was much more variable with lower amounts of correction. The relationship was more constant and linear with larger amounts of refractive correction. CONCLUSIONS The relationship between the measured change in simulated K and the induced refractive change better fit a nonlinear relationship with smaller amounts of refractive correction in custom LASIK and conventional LASIK. Under all forms of analysis, custom treatments yielded a greater per-unit change in corneal curvature than conventional treatments, especially for refractive corrections of 4.00 D and higher.
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Affiliation(s)
- Cheri Leng
- Department of Ophthalmology & Vision Science, University of California, Davis, Medical Center, Sacramento, California, USA
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Lee SY, Chung JL, Hong JP, Seo KY, Kim EK, Kim TI. Comparative Study of Two Aspheric, Aberration-Free Intraocular Lenses in Cataract Surgery. JOURNAL OF THE KOREAN OPHTHALMOLOGICAL SOCIETY 2009. [DOI: 10.3341/jkos.2009.50.10.1520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Sang Yeop Lee
- The Institute of Vision Research, Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea
| | - Jae Lim Chung
- The Institute of Vision Research, Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea
| | - Jin Pyo Hong
- The Institute of Vision Research, Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea
| | - Kyoung Yul Seo
- The Institute of Vision Research, Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea
| | - Eung Kweon Kim
- The Institute of Vision Research, Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea
| | - Tae Im Kim
- The Institute of Vision Research, Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea
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Hwang SJ, Choi SK, Oh SH, Lee JH, Kim JH, Lee DH. Surgically Induced Astigmatism and Corneal Higher Order Aberrations in Microcoaxial and Conventional Cataract Surgery. JOURNAL OF THE KOREAN OPHTHALMOLOGICAL SOCIETY 2008. [DOI: 10.3341/jkos.2008.49.10.1597] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Sang Jo Hwang
- Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, Korea
| | - Suk Kyue Choi
- Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, Korea
| | | | - Jong Hyun Lee
- Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, Korea
| | - Jin Hyoung Kim
- Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, Korea
| | - Do Hyung Lee
- Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, Korea
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Corneal aberrations after microincision cataract surgery. J Cataract Refract Surg 2008; 34:40-5. [DOI: 10.1016/j.jcrs.2007.08.022] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2007] [Accepted: 08/10/2007] [Indexed: 11/15/2022]
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Yao K, Tang X, Ye P. Corneal Astigmatism, High Order Aberrations, and Optical Quality After Cataract Surgery: Microincision Versus Small Incision. J Refract Surg 2006; 22:S1079-82. [PMID: 17444097 DOI: 10.3928/1081-597x-20061102-13] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
PURPOSE To compare the astigmatism, high order aberrations, and optical quality of the cornea after microincision (approximately 1.7 mm) versus small incision approximately 3.2 mm) cataract surgery at Eye Center, Zhejiang University, Hangzhou, China. METHODS This prospective, randomized clinical study included microincision cataract surgery and small incision cataract surgery performed on 60 eyes. Corneal astigmatism and higher order aberrations to the sixth order were measured using the NIDEK OPD-Scan aberrometer/topographer 1 month after surgery. To evaluate the optical quality of the cornea, the 0.5 modulation transfer function (MTF) value and 0.1 MTF value within a 5-mm pupil were calculated using OPD-Station software. Statistical analysis assessing the difference between groups was carried out using the independent t test. RESULTS The mean corneal astigmatism was significantly lower after microincision cataract surgery compared with small incision cataract surgery (0.78+/-0.38 diopters [D] vs 1.29+/-0.68 D, respectively; P=.001). No significant differences were found between the two groups for the root-mean-square value of total high order aberrations or individual high order aberrations for spherical aberration, coma, and trefoil. However, eyes that underwent microincision cataract surgery showed statistically significantly better optical performance with a 0.5 MTF value than eyes that underwent small incision cataract surgery (3.13+/-0.30 cycles per degree [cpd] vs 2.75+/-0.63 cpd, respectively; P=.005). The 0.1 MTF values for the two groups were 9.37+/-3.72 cpd for microincision cataract surgery and 7.24+/-3.43 cpd for small incision cataract surgery, which was not significantly different (P=.136). CONCLUSIONS Microincision cataract surgery generates statistically significantly less corneal astigmatism and better optical quality of the cornea by MTF evaluation compared with small incision cataract surgery. However, microincision cataract surgery shows no significant advantage in reducing corneal high order aberrations over small incision cataract surgery.
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Affiliation(s)
- Ke Yao
- Eye Center, Affiliated Second Hospital, College of Medicine, Zhejiang University, Hangzhou, China.
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