Infant Visual Acuity as a Function of Viewing Distance

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Abstract
Dynamic retinoscopy has suggested that near vision may be more acute than far vision during early infancy. To test this, acuity thresholds were determined by presenting square wave gratings in a preference paradigm to 1 and 2 mo. old human infants at 4 viewing distances. Gratings were paired with unpatterned fields; direction of 1st fixation was the dependent measure. Infants exhibited the same acuity at each of the distances at which gratings were presented. The results were interpreted as compatible with the fact that considerable optical defocusing does not seriously affect a visual system, such as the infant''s, that is sensitive only to low spatial frequencies.

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