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Fixation disparity and near visual acuity
T C Jenkins1, F Abd-Manan, S Pardhan
1Department of Optometry, University of Bradford, West Yorkshire, UK.
Summary
Patients with associated heterophoria showed reduced binocular visual acuity improvement. Prism correction normalized this improvement, indicating its effectiveness in managing heterophoria-related visual deficits.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Associated heterophoria can impact visual performance.
- Understanding its effect on visual acuity is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the impact of associated heterophoria on near monocular and binocular visual acuity.
- To assess the efficacy of prism correction in mitigating these effects.
Main Methods:
- Twenty patients with associated heterophoria (≥2 delta) were recruited.
- Near visual acuity was measured using Bradford Near Vision charts.
- Measurements were taken in monocular and binocular conditions, with and without prism correction for heterophoria.
Main Results:
- Binocular visual acuity improvement over monocular acuity was less pronounced in patients with heterophoria compared to normal subjects.
- Prism correction of associated heterophoria restored the expected improvement in binocular over monocular acuity.
Conclusions:
- Associated heterophoria significantly impairs the natural improvement in binocular visual acuity.
- Prism correction is an effective method to normalize binocular visual function in individuals with associated heterophoria.