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  • Title: Infants' acuity at twenty feet.
    Author: Cornell EH, McDonnell PM.
    Journal: Invest Ophthalmol Vis Sci; 1986 Sep; 27(9):1417-20. PubMed ID: 3744733.
    Abstract:
    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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