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N. Nakayama, T. Kawamorita, T. Handa, H. Uozato; Effect of Refractive Correction on Ocular Dominance. Invest. Ophthalmol. Vis. Sci. 2007;48(13):1008.
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To investigate the effect of refractive correction or refractive defocus on the assessment of ocular dominance.
Fifty eyes of 25 subjects (range, 20-31 years) were included in this study. Mean spherical equivalents were -3.02±2.01 D in the dominant eye and -2.97±2.25 D in the non dominant eye.The dominant eye was determined using a hole-in-card test (sighting eye dominance) and binocular rivalry (sensory eye dominance). The quantitative measurement of sensory eye dominance was performed using binocular rivalry with full refractive correction and addition of positive lens on dominant eye under mesopic condition. The contrast of the target in non dominant eye was fixed at 100%, and dominant eye was changed from 100% in steps of 10%. Quantities of ocular dominance were evaluated as reversal point where exclusive visibility of non dominant eye crossed over that of dominant eye. Also the measurements were repeated after addition of positive lens on dominant eye. In addition stereopsis in reversal point was measured.
The reversal point changed in 40 % of the subjects after addition 0.25 D, in 53 % after add 0.50 D, in 93 % after add 0.75 D, and in 100 % after add 1.00 D. The mean added lenses were 0.55±0.25 D.There was no statistically significant effect of refractive correction on stereopsis andsighting eye dominance(p>0.05, Wilcoxon test).
Ocular dominance (sensory eye dominance) changed after addition of positive lens on dominant eye. The results suggest that refractive correction affected sensory eye dominance, not affect stereopsis in less than 1.00D addition on dominant eye.
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