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Ideal size of an intraocular lens for capsular bag fixation
1Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
Purpose:
To determine the ideal size of 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 three groups. Intraocular lenses of five different sizes were implanted in each capsular bag. The arc of contact between the haptics and capsular equator and the capsular bag distortion with each IOL were measured and compared using posterior-view analysis.
Results:
The arc of contact was directly proportional to the IOL size and inversely related to the lens size. The smallest arc of contact was 2.0 mm with the smallest 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 the smallest lens group.
Conclusion:
Implanting an IOL smaller than 12.5 mm in a large capsular bag can result in unstable fixation, while implanting an IOL larger than 12.5 mm in a small capsular bag can result in excessive stretching and distortion of the capsular bag and surrounding zonules.