Investigative Ophthalmology & Visual Science, Vol 26, 1158-1162, Copyright © 1985 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

The acuity card procedure: a rapid test of infant acuity

MA McDonald, V Dobson, SL Sebris, L Baitch, D Varner and DY Teller

Forced-choice preferential looking (FPL) and operant preferential looking (OPL) procedures for testing infant acuity typically require 15- 45 min to derive an acuity estimate. This article presents a new acuity assessment technique ("acuity cards") that combines FPL/OPL stimuli with an observer's subjective assessment of an infant's looking behavior. The infant is shown a series of gray cards that contain grating targets of various spatial frequencies. An observer watches the eye movement patterns and behavior of the infant and judges whether the infant can or cannot see the grating on each card in the series. Acuity is estimated as the highest spatial frequency that the observer judges the infant to be able to see. With this technique, the binocular acuity of normal infants can be estimated with reasonable accuracy in the laboratory setting in 3-5 min.

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