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Science 20 October 1978:
Vol. 202. no. 4365, pp. 331 - 333
DOI: 10.1126/science.694540
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Articles

Science, Vol 202, Issue 4365, 331-333
Copyright © 1978 by American Association for the Advancement of Science

articles

Infant astigmatism measured by photorefraction

HC Howland, J Atkinson, O Braddick, and J French

Photorefraction of a sample of 93 infants of ages 1 day to 12 months showed that 63 percent of the subjects had astigmatism of 0.75 diopter or greater, and 12 percent greater than 2 diopters. Seventy percent of these astigmatisms were in the horizontal-vertical meridians. By comparison, only 8 percent of a sample of 26 adults tested by the same method showed astigmatism (all 0.75 to 1 diopter). The high incidence of infant astigmatism has implications for critical periods in human visual development and for infant acuity.


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