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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Effect of intraocular lens design on neodymium:YAG laser capsulotomy rates.
Journal of Cataract and Refractive Surgery 1998 September
PURPOSE: To compare the effect of 2 poly(methyl methacrylate) (PMMA), 1-piece biconvex intraocular lens (IOL) designs on the cumulative frequency of neodymium:YAG (Nd:YAG) laser posterior capsulotomy.
SETTING: Department of Ophthamology, Mayo Clinic, Rochester, Minnesota, USA.
METHODS: This retrospective study evaluated 369 eyes that had phacoemulsification with continuous curvilinear capsulorhexis (CCC) and IOL implantation in the capsular bag. Patients were placed in 1 of 2 groups based on the 1-piece, biconvex PMMA IOL design: large IOL, with a lens diameter of 13.50 to 13.75 mm, optic size of 6.5 mm, and 10 degree haptic angulation; small capsular IOL, with a lens diameter of 12.0 to 12.5 mm, optic size of 5.5 mm, and 2 degree haptic angulation.
RESULTS: Using Kaplan-Meier analysis, the frequency of Nd:YAG laser posterior capsulotomy 1, 2, and 3 years after cataract surgery was 1.6, 12.3, and 26.5%, respectively, in the large IOL group and 3.4, 9.5, and 23.5%, respectively, in the small capsular IOL group. The cumulative frequency of Nd:YAG laser capsulotomy was not statistically different between the 2 groups.
CONCLUSION: After phacoemulsification and CCC, there was no significant difference in the Nd:YAG laser capsulotomy rate in eyes with a small, capsular design, 1-piece, biconvex PMMA IOL and those with a larger, angulated, 1-piece, biconvex PMMA IOL.
SETTING: Department of Ophthamology, Mayo Clinic, Rochester, Minnesota, USA.
METHODS: This retrospective study evaluated 369 eyes that had phacoemulsification with continuous curvilinear capsulorhexis (CCC) and IOL implantation in the capsular bag. Patients were placed in 1 of 2 groups based on the 1-piece, biconvex PMMA IOL design: large IOL, with a lens diameter of 13.50 to 13.75 mm, optic size of 6.5 mm, and 10 degree haptic angulation; small capsular IOL, with a lens diameter of 12.0 to 12.5 mm, optic size of 5.5 mm, and 2 degree haptic angulation.
RESULTS: Using Kaplan-Meier analysis, the frequency of Nd:YAG laser posterior capsulotomy 1, 2, and 3 years after cataract surgery was 1.6, 12.3, and 26.5%, respectively, in the large IOL group and 3.4, 9.5, and 23.5%, respectively, in the small capsular IOL group. The cumulative frequency of Nd:YAG laser capsulotomy was not statistically different between the 2 groups.
CONCLUSION: After phacoemulsification and CCC, there was no significant difference in the Nd:YAG laser capsulotomy rate in eyes with a small, capsular design, 1-piece, biconvex PMMA IOL and those with a larger, angulated, 1-piece, biconvex PMMA IOL.
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