DECENTRATION AND TILT OF POLYMETHYL METHACRYLATE, SILICONE, AND ACRYLIC SOFT INTRAOCULAR LENSES

Purpose: The purpose of the study is to investigate the periodic chang es regarding the decentration and tilt of the intraocular lens (IOL) a nd to compare any differences in the decentration and tilt among polym ethyl methacrylate (PMMA), silicone, and acrylic soft IOLs. Methods: A total of 225 cataractous eyes undergoing IOL implant surgery were ran domized into 3 groups based on the type of IOL: group A, one-piece PMM A IOL; group B, three-piece silicone IOL; and group G, three-piece acr ylic soft IOL. Both the length of the decentration and the degree of t he tilt of the IOL were quantitated using the Anterior Eye Segment Ana lysis System (EAS-1000). All eyes underwent EAS-1000 examinations at 1 week as well as 1, 3, 6, 9, and 12 months after surgery. Results: All IOLs were confirmed to be implanted accurately in the capsular bag af ter continuous curvilinear capsulorhexis was accomplished. No statisti cally significant differences were observed regarding the IOL decentra tion or tilt between the various postoperative periods in any of the t hree IOL groups. Furthermore, the differences regarding both the IOL d ecentration and the tilt between the three IOLs were not determined to be statistically significant throughout the observation period. Concl usions: As long as the IOL was placed properly in the capsular bag aft er the continuous capsulorhexis, neither the decentration nor the tilt of the IOL showed a significant progression up to 12 months after sur gery. Furthermore, both the extent of the decentration and tilt almost were the same among the PMMA, silicone, and acrylic soft IOLs.