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Investigative Ophthalmology & Visual Science, Vol 27, 1417-1420, Copyright © 1986 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Infants' acuity at twenty feet

EH Cornell and PM McDonnell

Measurement of duration of fixation was used to assess the ability of 6- , 12-, 24-, and 36-week-old infants to discriminate black-and-white square-wave gratings from a homogeneous gray field at a distance of 20 ft (6.1 m). Acuity was estimated as the smallest stripe width detectable by at least 18 of the 24 infants in a given age group. The strip width was considered detectable if it was fixated longer than a homogenous gray field. The results are consistent with estimates of infants' threshold acuity obtained at target distances less than 5 feet (1.5 m). Because of the 20-ft viewing distance, these infants' acuity in Snellen notation can be more confidently estimated.




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Copyright © 1986 by the Association for Research in Vision and Ophthalmology