A method used to assess visual acuity in pre-verbal infants and young children. It involves presenting two side-by-side stimuli: one with black and white stripes (gratings) of varying spatial frequencies, and the other a homogeneous gray field matched for luminance. An observer judges which stimulus the infant preferentially looks at by monitoring their eye and head movements. The finest grating the infant can resolve provides an estimate of their visual acuity.
Sources
American Academy of Ophthalmology. 2019. Amblyopia Preferred Practice Pattern. San Francisco: American Academy of Ophthalmology.
Dobson, V. and Teller, D.Y. 1978. Visual acuity in human infants: a review and comparison of behavioral and electrophysiological studies. Vision Research, 18(11), pp.1469-1483.
Fantz, R.L. 1965. Visual perception from birth as shown by pattern selectivity. Annals of the New York Academy of Sciences, 118(21), pp.793-814.
McDonald, M.A., Dobson, V., Sebris, S.L., Baitch, L., Varner, D. and Teller, D.Y. 1985. The acuity card procedure: a rapid test of infant acuity. Investigative Ophthalmology & Visual Science, 26(8), pp.1158-1162.
Rutstein, R. and Daum, K. 1997. Anomalies of Binocular Vision: Diagnosis & Management. St. Louis: Mosby.
Teller, D.Y., McDonald, M.A., Preston, K., Sebris, S.L. and Dobson, V. 1986. Assessment of visual acuity in infants and children: the acuity card procedure. Developmental Medicine & Child Neurology, 28(6), pp.779-789.