A novel, "dual optic" accommodating intraocular lens improved intermediate distance vision and contrast sensitivity under low light conditions compared with some multifocal lenses, researchers said.

The findings, reported in two studies from the same research group here at the American Academy of Ophthalmology meeting, suggest that the new generation of lens will hold functional advantages for patients undergoing cataract surgery.

First generation monofocal lenses were often used to create "bifocal" vision, with the lens in one eye set for distance vision and the other set for near objects. To overcome the poor depth perception this created, the next generation of multifocal lenses allowed both eyes simultaneously to focus on far or near objects for "more natural vision with depth perception.

Andrea Galvis, MD, of the Fundación Valle del Lili in Cali, Colombia compared three of these "premium" intraocular lenses with an experimental lens (Synchrony) designed with a dual optic to theoretically provide a more accommodative amplitude. The study included patients given the same lens in both eyes during different "eras" of lens implantation. For a functional, real life performance test of contrast sensitivity, patients were given a reading speed test under low-light conditions.

The difference was significant for Tecnis and Synchrony compared with ReZoom and ReSTOR at P<0.001.>

Synchrony had the highest contrast sensitivity of all the lenses.

Posted in: Cataract surgery, Eye, intraocular