Adaptation to multifocal and monovision contact lens correction

摘要

Purpose. To compare visual performance with the Biofinity multifocal (MF) contact lens with monovision (MV) with theBiofinity single-vision contact lens.Methods. A crossover study of 20 presbyopic patients was conducted. Patients were randomized first into either an MF oran MV lens for 15 days for each modality, with a washout period between each lens type. Measurements includedmonocular and binocular high- and low-contrast logarithm of the minimum angle of resolution visual acuity (VA) at distanceand near visions, binocular distance contrast sensitivity function, and near stereoacuity.Results. At 15 days, patients lost fewer than two letters (half a line of VA) of binocular distance and near VA, with the MF andMV lens under high- and low-contrast conditions (P 9 0.05 for both comparisons). No statistically significant differenceswere seen in binocular VA at near or distance with either lens. However, the monocular distance VA improved significantlyin the nondominant eye, with the MF lens by one line over the 15-day period under high-contrast (P = 0.023) and lowcontrast(P = 0.035) conditions; this effect was not seen with the MV lens. Contrast sensitivity function was within the normallimits with both lenses. The stereoacuity was significantly (P G 0.01) better with MF than with MV.Conclusions. Multifocal contact lens correction provided satisfactory levels of VA comparable with MV withoutcompromising stereoacuity in this crossover study. The near vision significantly improved in the dominant eye, and thedistance vision improved in the nondominant eye from 1 to 15 days with the MF lens, suggesting that patients adapted to themultifocality overtime, whereas this was not true for MV.(Optom Vis Sci 2013;90:228Y235)