The effects of monovision on stereopsis and driving performance were evaluated on thirty-eight subjects (ages 22 to 55 years). Monovision performance was compared to the performance with distance contact lenses. Each subject had good ocular health, no apparent strabismus, and less than 1.00D of uncorrected astigmatism. Visual acuity and stereo acuity at 6m and 40cm, acuity suppression at 6m, and driving performance were measured for each condition. The results of the study indicated that mono vision reduced several aspects of visual performance. A significant difference (t=11.82, p=0.0001, df-=35) was present for distance visual acuity between the eye corrected for near compared to the eye corrected for distance. Near stereo acuity (t=3.16, p=0.0033, df=34) and distance stereo acuity (t=7.43, p=0.0001, df=20) were both significantly decreased with the monovision modality. The monovision lens showed a significant increase (t=-3.42, p=0.0016, df=35) in the amount of driving error. The statistical results were skewed because only those subject that were affected the least by monovision were analyzed. The subjects whose grossest level of stereo acuity and acuity suppression fell outside the measurable limits of the BVAT were excluded from the statistical analysis.
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