Differences in Visual Performance of Acrysof ReSTOR IOL in High and Low Myopic Eyes

Abstract

To determine the differences in refractive and visual results obtained in eyes with high and low myopia after multifocal intraocular lens (IOL) implantation. Monocular visual acuity for distance and near, with and without distance correction, and photopic and mesopic contrast sensitivity were measured at 6 months after surgery in 152 myopic eyes implanted with the AcrySof ReSTOR Natural (SN60D3) IOL. Two groups were created: high and low myopia (76 eyes in each). Monocular best distance-corrected visual acuity was 0.02+/-0.06 logMAR for low myopes and 0.05+/-0.09 logMAR for high myopes. Monocular best distance-corrected near visual acuity was 0.04+/-0.05 and 0.07+/-0.08 logMAR for low and high myopes, respectively. Contrast sensitivity for high myopic eyes under photopic conditions was lower, primarily at high spatial frequencies, in relation to low hyperopic. Differences between both groups were statistically significant for 6 and 18 cycles per degree (cpd) spatial frequencies (p<0.006). At mesopic level, high myopic eyes showed lower values compared to low myopic eyes for all spatial frequencies. However, these differences were only statistically significant for 3, 6, and 12 cpd (p<0.003). The AcrySof ReSTOR IOL provided good visual acuity and contrast sensitivity for both distance and near, with and without distance correction; however, better results were found in low myopic eyes compared to those obtained in eyes with high levels of myopia.