Long-term ultrasound biomicroscopy observation of position changes of a copolymer posterior chamber phakic intraocular lens

Abstract

Purpose: To evaluate longitudinal changes in Implantable Collamer Lens phakic intraocular lens (pIOL) position after implantation.

Setting: Department of Ophthalmology, Zhejiang University, Hangzhou, China.

Design: Retrospective case series.

Methods: Myopic eyes that had pIOL implantation with a follow-up of at least 24 months were evaluated. Ultrasound biomicroscopy examinations were performed at each visit.

Results: The study enrolled 62 eyes (31 patients; 22 women, 9 men) ranging in age from 21 to 46 years. The manifest spherical equivalent ranged from -8.25 to -18.75 diopters. A significant increase (mean 36 μm±50 [SD]) in the endothelium-anterior pIOL distance occurred between 1 month and 3 months (P=.000); afterward, the distance decreased slowly (P>.05). The largest decrease (mean 47±17 μm) in central vault occurred between 1 month and 3 months (P=.009). The largest decrease (mean 21±14 μm) in peripheral vault occurred between 1 month and 3 months (P=.000).

Conclusions: A significant increase in the endothelium-anterior pIOL distance occurred from 1 month to 3 months postoperatively, after which a slight decrease occurred over time. Central vault and peripheral vault had a tendency to decrease over time.

Financial disclosure: No author has a financial or proprietary interest in any material or method mentioned.