Inverted meniscus IOLs reduce image shifts in the periphery compared to biconvex IOLs.

Abstract

Intraocular lenses (IOLs) are routinely used to replace cataractous crystalline lenses. Most current models have a biconvex design that reduces optical quality in the periphery since they are optimized only for central vision. Inverted meniscus IOLs are optimized to achieve similar optical performance to phakic eyes in the peripheral retina. Additionally, biconvex IOLs have been predicted to induce image shifts in the peripheral visual field. The aim of this study was to evaluate whether inverted meniscus IOLs produce a more consistent object-to-image mapping on the retina. For this purpose, retinal images before and after IOL implantation were recorded in subjects implanted with either standard biconvex or inverted meniscus IOLs, and the positions of landmarks were compared. The results showed that radial displacement of retinal landmarks increased with eccentricity in biconvex IOLs, as expected, but tended to have a flatter progression with smaller values in patients implanted with inverted meniscus lenses.