Stereoacuity After Bilateral Implantation Of Monofocal Intraocular Lenses And Bilateral Implantation Of Diffractive Multifocal Intraocular Lenses

To evaluate stereopsis from far to near after bilateral implantation of multifocal intraocular lens (IOL) and bilateral implantation of monofocal IOLs.

Ohashi Eye Center, Sapporo, Hokkaido, Japan

173 patients who underwent cataract surgery were enrolled in this experiment (70 patients with multifocal IOLs, Acrysof IQ PanOptix, and 103 patients with monofocal IOLs). Stereopsis was measured at 0.3m, 0.5m, 0.7m, 3m, and 5m by Binoptometer® 4P. Measurement was performed without correction in multifocal group and with correction in monofocal group.

Stereoacuity was significantly better in multifocal group than in monofocal group at all distances (p＜0.01). The rates of the patients had 100 seconds or better at 0.3m, 0.5m, 0.7m, 3m and 5m were 69%, 77%, 81%, 80% and 80% in multifocal group, 58%, 52%, 54%, 60% and 62% in monofocal group; the difference was statistically significant at 0.5m, 0.7m, 3m, and 5m (p＜0.01). The rates of the patients could not identify the greatest parallax gradient (600 seconds of arc) at 0.3m, 0.5m, 0.7m, 3m and 5m were 11%, 9%, 9%, 5% and 6% in monofocal group, 3% at 0.3m and 0% at the other distances in multifocal group; the difference was statistically significant at 0.5m, 0.7m and 5m(p＜0.05).

Patients with multifocal IOLs showed better stereopsis compared to the patients with monofocal IOLs at all distances. Surprisingly, the rates of the patients had poor stereopsis were higher in monofocal group than in multifocal group. Multifocal IOLs may preserve stereopsis than monofocal IOLs.