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Investigative Ophthalmology & Visual Science, Vol 29, 44-49, Copyright © 1988 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

High visual contrast sensitivity in the young human infant

AM Norcia, CW Tyler and RD Hamer
Smith-Kettlewell Eye Research Foundation, San Francisco, CA 94115.

The visual evoked potential (VEP) was used to estimate photopic contrast sensitivity of 10-week-old infants over a wide range of spatial frequencies including the acuity limit. Adult and infant VEP contrast sensitivity was compared for sinusoidal luminance gratings reversed in contrast at 6 Hz. Space-average luminance was 220 cd/m2. Grating contrast was swept from well below the measured thresholds to well above them in 10 sec trials. Contrast thresholds were defined as the zero voltage intercept of the initial rising portion of the VEP amplitude versus contrast function. The VEP contrast sensitivity of 10- week-old infants was close to that of the adults for spatial frequencies below about 1 cycle (c)/deg.


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