Abstract
Summary
Minimum separable visual acuity thresholds were established by an op tokinetic nystagmus acuity test in Rhesus monkey, Baboon, Gibbon, and human newborn infants. Acuity thresholds ranged from 9 minutes of arc in the Baboon to 40 minutes in the human infants at birth. Visual acuities increased rapidly to 4 minutes by the end of the first month in the Rhesus monkey and Baboon infants. The same level of visual resolution was attained by the Gibbon and Orangutan infants only by the end of the second month, and approximately at the end of the sixth month by the human infants.
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