Abstract
The relative clinical performance of monovision and the Hydro® ECHELON® soft diffractive bifocal contact lens were evaluated in a 1 -month, two-period, open-label crossover study. Wearers' subjective impressions were also elicited. Monovision provided superior low contrast acuity and the bifocal better stereopsis. No difference was found for high-contrast visual acuity or physiological signs. Although monovision was subjectively preferred for reading, no difference was found for other subjective variables. These included visual quality ratings at far and intermediate viewing distances, under dimly lit conditions, when driving at night, and for overall preference. Similiar patient acceptance can be expected for both modalities. The results of this study reflect a significant improvement in performance of the diffractive bifocal lens over previous simultaneous vision bifocal contact lens damage.
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