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Vertical fusional amplitudes in patients wearing vertical anisometropic correction
S R Griebel1, C D Riemann, E L Szymusiak
1Cleveland Clinic, Ohio, USA.
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.
