Anisometropia and the Rod-and-Frame Task

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Abstract
Ss were 77 female college freshmen. Anisometropic Ss (defined as having more than 1′ of visual angle of difference in resolving power between the two eyes as measured while viewing Orthorater stimuli binocularly) were significantly poorer in rod-and-frame performance than were isometropic Ss. Similarly, Ss with poor rod-and-frame performance were found to be anisometropic significantly more often than Ss with good rod-and-frame performance. There was no difference in rod-and-frame performance between anisometropic Ss who did or did not become isometropic when tested monocularly on the Orthorater. These results are tentatively interpreted as due to cyclophoria leading to visual suppression.

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