History: This 11-year-old boy has 30 diopters of exotropia in the primary position. Visual acuity is 20/20 in each eye and refraction is plano in each eye. He chronically assumes left face turn of 20 degrees, with eyes right. He fuses 40 seconds of arc and reports occasional diplopia but he is not bothered.
Diagnosis: Duane syndrome, Class II
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