Abstract
Objective To examine the relationship between vertical anisometropic spectacle correction and vertical fusional amplitudes in patients. Design Comparative observational case series. Participants Twenty-one patients exposed to greater than 0.5 diopters of vertical anisometropic spectacle correction were compared with 46 patients not exposed to anisometropic correction. Methods Vertical fusional amplitudes were recorded in all patients using a prism bar. Main outcome measures Vertical fusional amplitudes and vertical anisometropia. Results In patients exposed to greater than 0.5 diopters of vertical anisometropic spectacle correction, vertical fusional amplitudes measured 5.2 ± 1.4 prism diopters. Patients not exposed to anisometropic correction had vertical fusional amplitudes of 2.7 ± 1.2 prism diopters ( P < 0.0001). Conclusion Patients with vertical anisometropic correction have increased vertical fusional amplitudes. This finding is relevant when evaluating patients with ocular motility disorders, especially with regard to distinguishing acquired versus longstanding deviations.
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