January 1988
Volume 29, Issue 1
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Articles  |   January 1988
High visual contrast sensitivity in the young human infant.
Author Affiliations
  • A M Norcia
    Smith-Kettlewell Eye Research Foundation, San Francisco, CA 94115.
  • C W Tyler
    Smith-Kettlewell Eye Research Foundation, San Francisco, CA 94115.
  • R D Hamer
    Smith-Kettlewell Eye Research Foundation, San Francisco, CA 94115.
Investigative Ophthalmology & Visual Science January 1988, Vol.29, 44-49. doi:
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      A M Norcia, C W Tyler, R D Hamer; High visual contrast sensitivity in the young human infant.. Invest. Ophthalmol. Vis. Sci. 1988;29(1):44-49.

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      © 2016 Association for Research in Vision and Ophthalmology.

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Abstract

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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