Abstract

The Acuity Card Procedure is a rapid, subjective method for estimating grating acuity in infants and young children. In the procedure, the child is shown a series of gray cards, 28 by 58 cm in size, each of which contains a black-and- white square-wave grating located to the left or right of a small (4 mm diameter) central aperture. The tester, who is unaware of the location of the grating on each card, watches the child's eye movements through the aperture and decides, on the basis of the child's looking behavior, which cards contain gratings that can be resolved by the child. Acuity is estimated as the spatial frequency of the finest grating that the tester judges that the child can resolve, as indicated by the child's consistent looking toward the location of the grating upon repeated presentations of the card.

© 1991 Optical Society of America