Binocular function after bilateral implantation of monofocal and refractive multifocal intraocular lenses

Abstract

To evaluate binocular function after bilateral implantation of a refractive multifocal intraocular lens (IOL). Contrast sensitivity, glare, depth discrimination, and distance and near visual acuity were examined in 21 patients with a multifocal IOL and 15 patients with a monofocal IOL. There was no significant difference in binocular distance visual acuity between the 2 groups. In near visual acuity with distance correction, the multifocal group had a significant advantage in monocular and binocular vision (P < .05). High contrast with Regan contrast letter acuity charts did not differ significantly between the groups. However, at a contrast of 11%, sensitivity was significantly lower monocularly in the multifocal group. Contrast sensitivity in this group was not significantly lower binocularly. The brightness acuity tester revealed no between-group difference in glare. With the Titmus stereotest, depth discrimination was significantly better with the multifocal IOL with distance correction. Bilateral implantation of a refractive multifocal IOL provided good binocular function and alleviated the well-known disadvantage of reduced contrast sensitivity at low contrast levels.