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Len Zheleznyak, Aixa Alarcon, Kevin Dieter, Duje Tadin, Geunyoung Yoon; The role of eye dominance on through-focus visual performance in modified monovision presbyopic corrections. Invest. Ophthalmol. Vis. Sci. 2013;54(15):4252.
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© ARVO (1962-2015); The Authors (2016-present)
To investigate the impact of the degree of sensory eye dominance on through-focus visual performance in presbyopic corrections with modified and traditional monovision.
The degree of sensory eye dominance was measured using a binocular rivalry technique in which orthogonal sinusoidal gratings (4cyc/deg) were presented to each eye. The proportion of exclusive visibility of each grating was recorded as the right eye’s contrast varied from 10-90% while the left eye remained fixed at 50%. The degree of ocular dominance (DOD) was defined as the difference in interocular contrast which resulted in perceiving the two gratings for equal portions of time. A binocular adaptive optics vision simulator was used to correct 9 cyclopleged subjects’ native aberrations and induce modified monovision (1.5D anisometropia, spherical aberration of +0.1 and -0.4μm in distance and near eyes, respectively). To assess the impact of dominance on visual performance, through-focus visual acuity (VA) from 0.0 to 3.0D at 0.5D step with a 4mm artificial pupil was measured under two conditions by assigning dominant and non-dominant eye to distance and near, respectively, and vice versa. Traditional monovision of 1.5D anisometropia was measured for comparison.
Sensory eye dominance spanned from weak (DOD=4%) to strong (DOD=23%) dominance with average DOD=9±8%. The average difference in through-focus VA between switching eye assignment for distance in modified and traditional monovision was -0.01±0.04 and 0.00±0.03 logMAR, respectively. The subject with the strongest dominance experienced a loss in intermediate (0.5-1.5D) VA of 0.16±0.09 and 0.05±0.01 logMAR with modified and traditional monovision, respectively, when the non-dominant eye was assigned to distance compared to assigning the non-dominant eye to near.
For subjects with typical low and moderate levels of sensory eye dominance, the degree of dominance did not have a significant effect on through-focus VA in monovision regardless of which eye was assigned to distance and near. However, it is important for subjects with strong eye dominance to assign the dominant eye to distance vision for optimal through-focus VA, especially in modified monovision correction.
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