Intermediate vision and reading speed with array, Tecnis, and ReSTOR intraocular lenses

Abstract

Purpose: To retrospectively evaluate reading performance at intermediate distances of three types of multifocal intraocular lenses (IOLs) under different light conditions based on reading acuity and reading speed tests.

Methods: Thirty cataract patients (60 eyes) randomly assigned to receive the Array SA40N lens (n = 20 eyes), the Tecnis ZM001 lens (n = 20 eyes), and the ReSTOR lens (n = 20 eyes) were retrospectively tested for their reading abilities at distances of 40 cm, 60 cm, and 80 cm under low light conditions (6 cd/m2) and bright light conditions (100 cd/m2).

Results: LogMAR distance-corrected acuity in dim (bright) light at 40 cm was 0.456 (0.363) (Array), 0.446 (0.293) (ReSTOR), and 0.299 (0.140) (Tecnis); at 60 cm, it was 0.417 (0.259) (Array), 0.448 (0.318) (ReSTOR), and 0.381 (0.121) (Tecnis); at 80 cm, it was 0.359 (0.195) (Array), 0.395 (0.245) (ReSTOR), and 0.373 (0.124) (Tecnis). Uncorrected reading speed (words/min) in dim (bright) light at 40 cm was 25 (69) (Array), 58 (138) (ReSTOR), and 110 (166) (Tecnis); at 60 cm, it was 65 (129) (Array), 58 (129) (ReSTOR), and 135 (173) (Tecnis); and at 80 cm, it was 59 (153) (Array), 79 (164) (ReSTOR), and 121 (176 (Tecnis).

Conclusions: Our study indicates that Array, ReSTOR, and Tecnis IOLs provide functional intermediate vision in bright light. In dim light, however, the Tecnis IOL provides better uncorrected reading speed at intermediate distances than Array and ReSTOR IOLs.