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Cover-induced exotropia different from spontaneous exotropia. Recordings from a 35-year-old man (refraction: −1.25 +0.75 right eye; −1.25 left eye), showing that A, right exotropia induced by occlusion was smaller and more variable than B, spontaneous right exotropia. C, Covering the dominant left eye produced a highly variable outward eye movement; spontaneous left exotropia never occurred (Supplementary Video 1, available at www.aaojournal.org).
