Effect of Ocular Dominance and Modified Monovision on Visual Performance Compared With Traditional Monovision
Narrative Responses:
Purpose
To investigate the role of sensory ocular dominance on through-focus visual performance with various strategies of modified and traditional monovision presbyopic corrections.
Methods
The degree of sensory ocular dominance was measured using a binocular rivalry technique in which orthogonal sinusoidal gratings were presented to each eye. A binocular adaptive optics vision simulator corrected 9 cyclopleged subjects’ native aberrations and induced modified monovision (1.5D anisometropia, spherical aberration of +0.1 and -0.4µm in distance and near eyes, respectively). Through-focus visual acuity and contrast sensitivity (10cpd) from 0.0 to 3.0D 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.
Results
Through-focus visual acuity was improved in modified monovision compared with traditional monovision at intermediate and near object distances for all subjects. The degree of sensory ocular dominance in our subjects spanned from weak to strong. The average difference in through-focus VA between switching eye assignment for distance in modified and traditional monovision was negligible (-0.01±0.04 and 0.00±0.03 logMAR, respectively). Through-focus contrast sensitivity was improved when superior optical quality coincided with the dominant eye.
Conclusion
The degree of sensory ocular dominance had a significant impact on through-focus contrast sensitivity, but not on through-focus visual acuity. Dominant eye assignment to distance along with modified monovision provided the best binocular combination of distance, intermediate and near visual performance compared to traditional monovision.