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Abstract
We retrospectively analyzed the visual acuity of 600 patients with primary intermittent exotropia to determine the incidence of amblyopia. From this group 412 (68.7%) patients had equal vision between the two eyes, 111 (18.5%) patients had unequal vision of one line difference between the eyes and 77 (12.8%) patients had functional amblyopia. Reduced vision in the amblyopic group consisted of a median and average acuity of 6/12 and mild amblyopia occurred most frequently present in 56 (72.7%) cases. Significant refractive error in the amblyopic group included 16 cases with anisometropia, four with myopia and five with astigmatism/mixed astigmatism. The prevalence of amblyopia was similar among the different types of intermittent exotropias, however patients with a constant manifest exotropia at distance were more likely to exhibit amblyopia (21%) than those with an intermittent exotropia (9.3%). The frequency of reduced stereoacuity was not significant between the amblyopia group (67%) and non-amblyopic group (60%).