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Science 1 October 1999:
Vol. 286. no. 5437, pp. 108 - 110
DOI: 10.1126/science.286.5437.108
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Reports

Rapid Improvement in the Acuity of Infants After Visual Input

Daphne Maurer, 12* Terri L. Lewis, 12 Henry P. Brent, 1 Alex V. Levin 1

Visual acuity was assessed in 28 human infants who had been deprived of all patterned visual input by cataracts in one or both eyes until they were treated at 1 week to 9 months of age. Immediately after treatment, acuity was no better than that of normal newborns. Acuity improved significantly over the next month, with some improvement apparent after as little as 1 hour of visual input. Unlike findings at older ages, the pattern of results was the same for eyes treated for monocular and for binocular deprivation. The results indicate that patterned visual input is necessary for the postnatal improvement of human visual acuity and that the onset of such input initiates rapid functional development.

1 Department of Ophthalmology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada.
2 Department of Psychology, McMaster University, Hamilton, Ontario L8S 4K1, Canada.
*   To whom correspondence should be addressed at McMaster University. E-mail: maurer{at}mcmaster.ca

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