IDEAL SIZE OF AN INTRAOCULAR-LENS FOR CAPSULAR BAG FIXATION

Purpose: To determine the ideal size oi an intraocular lens (IOL) for proper capsular bag fixation in different sizes of evacuated capsular bags. Setting: Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea, and Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. Methods: Fifteen eyes obtained post-mortem were divided by crystalline lens size into t hree groups. Intraocular lenses of five different Sizes were implanted in each capsular bag. The arc of contact between the haptics and caps ular equator and the capsular bag distortion with each IOL were measur ed and compared using posterior-view analysis. Results: The are of con tact was directly proportional to the IOL size and inversely related t o the lens size. The smallest are of contact was 2.0 mm with the small est IOL implanted in the largest lens group. The maximum capsular bag distortion was 2.6 mm in the case of the largest IOL implantation in t he smallest lens group. Conclusion: Implanting an IOL smiler than 12.5 mm in a large capsular bag can result in unstable fixation, while imp lanting an IOL larger than 12.5 mm in a small capsular bag can result in excessive stretching and distortion of the capsular bag and surroun ding zonules.