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B Eliassi-Rad, EY Yoon, DH Shin, C Kim, MS Juzych, BA Hughes; Comparison of Refractive Error and Astigmatic Changes Following Polymethylmethacrylate (PMMA) or Foldable (Silicone or Acrylic) IOL Implantation in Primary Glaucoma Triple Procedure (PGTP) . Invest. Ophthalmol. Vis. Sci. 2002;43(13):3363.
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Purpose: This study was conducted to compare refractive error(RE) and changes in astigmatism between PMMA and foldable IOL(silicone or acrylic) implantation after PGTP.Methods: Studyconsisted of 348 eyes, of 348 POAG patients, that underwentPGTP: 237 eyes had PMMA IOL and 111 eyes had a foldable acrylicor silicone IOL. Patients were refracted at 3, 6, and 12 monthspostoperatively. The spherical equivalent and plus cylinderwere used to determine the RE and astigmatism, respectively.Results: There was a significant difference in RE change betweenthe PMMA IOL group and the foldable IOL group at the 3, 6, and12 month intervals (Table 1). The foldable IOL group showeda mean decrease in RE change postoperatively while the PMMAgroup showed a mean increase. There was also a significant differencein astigmatic change between the two groups at the 3, 6, and12 month intervals (Table 2). The foldable IOL group showedlittle astigmatic change while the PMMA IOL group showed a meanincrease in astigmatic change at all 3 time intervals. The foldableIOL group showed predominately against-the-rule astigmatism(ATR) postoperatively at all three time intervals. The PMMAIOL group showed ATR changes at the 3 and 6 month intervals,but with-the-rule astigmatism (WTR) at the 12 month interval.Conclusions: The foldable IOL group showed a mean decrease inRE and little change in astigmatism after PGTP while the PMMAIOL group showed mean increases in both RE and astigmatism.Thus, the size of the incision influences the RE and astigmatismfollowing PGTP. Table 1. Postoperative changes in RE betweenPMMA and foldable IOls after PGTP View OriginalDownload SlideView OriginalDownload SlideTable 2. Postoperative changesin astigmatism between PMMA and foldable IOLs after PGTP View OriginalDownload SlideView OriginalDownload Slide
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