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This study investigates the effect of fixation disparity on near visual acuity. Using specially designed Bradford Near Vision charts the authors have measured near binocular and monocular visual acuities in seconds of arc. Twenty patients with associated heterophoria had their visual acuity measured both with and without prismatic correction, and the findings suggest a small improvement in binocular...
Twenty patients having associated heterophoria values of 2 Δ and greater, as recorded with a Mallett unit, had their near monocular and binocular visual acuities measured. In the latter case, measurements were taken both with the associated heterophoria corrected by prisms and without prism correction. Bradford Near Vision charts, specially designed to measure visual acuity at near in seconds of...
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