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A. Matsuo, S. Honda, H. Toda, I. Saito; The Postoperative Rotation of Implanted Intraocular Lenses . Invest. Ophthalmol. Vis. Sci. 2003;44(13):259.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: The rotation of intraocular lens (IOL) after cataract surgery is not well documented compared to tilting or decentration of IOL. The rotation of mono-focal IOLs does not affect visual acuity, but the rotation of toric IOL may cause unpredictable visual outcome. The toric IOLs are currently made with polymethylmethaclylate (PMMA) or silicone, but not with aclyl, which is expected to have better intracapsular stability because of its stickability. In this study, we compare the incidence and degree of IOL rotation for aclylic and PMMA IOLs. Methods: The patients who received cataract surgery were given for aclylic IOL (MA30BA, Alcon, Fort Worth, Texas) or PMMA IOL (LS102, Santen, Osaka, Japan). The mean age of patients was 69.6±7.8 years for aclylic IOL and 65.4±9.3 years for PMMA IOL. In all cases, continuous curvilinear capsulorhexis and phacoemusification were performed. The cases having tears or rupture of capsule were excluded. The images of IOL implanted were taken by digital video camera (Sony, Tokyo, Japan) at the end of surgery and by SL-7F digital camera (Topcon, Tokyo, Japan) on the day 1, 7, 30, 90 and 180 after surgery. The images were analyzed with Adobe Photoshop and the degree of rotation was calculated. Results: On the first day after surgery, ten out of 58 eyes (17.2%) showed IOL rotation over 5 degrees and no eye showed IOL rotation over 10 degrees with aclylic IOL, while three out of 22 eyes (13.6%) showed IOL rotation over 5 degrees and two of them showed the rotation over 10 degrees with PMMA IOL. In the group showing IOL rotation over 5 degrees, the mean rotation degree was 6.9±1.6 with aclylic IOL, while PMMA IOL showed 9.3±4.6 degrees. The difference of rotation degree between PMMA and aclylic IOLs was statistically significant (p<0.01). On the day 180, the degree of IOL rotation changed to 6.7±2.2 in aclylic IOL and 11.7±3.3 in PMMA IOL. The changes between the day first and later time points were not statistically significant for both IOLs. Conclusion: Our results suggest that aclylic IOL has better performance in preventing IOL rotation than PMMA IOL. Therefore aclyl could be better material for toric IOL in this respect.
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