COMPARISON OF DECENTRATION AND TILT BETWEEN ONE-PIECE AND 3 PIECE POLYMETHYL METHACRYLATE INTRAOCULAR LENSES

Background-The extent of the decentration and tilt was prospectively c ompared between one piece polymethyl methacrylate (PMMA) and three pie ce PMMA intraocular lenses (IOLs) which were implanted in the capsular bag after performing continuous curvilinear capsulorhexis. Methods-91 patients underwent a one piece PMMA IOL implantation in one eye as we ll as the implantation of the three piece PMMA IOL with polyvinylidene fluoride loops in the opposite eye. The length of the lens decentrati on and the angle of the tilt were quantitated using the anterior eye s egment analysis system (EAS-1000) at 1 week as well as 1, 3, and 6 mon ths postoperatively. Results-The mean length of the decentration in th e one piece IOL was smaller than that in the three piece IOL at 1 week (p=0.0092), 1 month (p=0.0044), 3 months (p=0.0069), and 6 months (p= 0.0010) postoperatively. However, no significant difference was found in the degree of the tilt between the two types of IOLs throughout the observation periods. Conclusion-These results clarified that the one piece PMMA IOL with rigid PMMA LA haptics implanted in the capsular ba g provides a better centration than the three piece PMMA IOL with flex ible haptics, whereas the tilt was the same between the two types of I OLs.