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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 57, Iss. 3 — Mar. 1, 1967
  • pp: 421–427

Effect of Exposure Duration on Visual Contrast Sensitivity with Square-Wave Gratings

JACOB NACHMIAS  »View Author Affiliations


JOSA, Vol. 57, Issue 3, pp. 421-427 (1967)
http://dx.doi.org/10.1364/JOSA.57.000421


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Abstract

Contrast sensitivity for square-wave gratings of spatial frequencies between 0.44 and 33.2 cycles/deg was determined for exposure durations between 11 and 500 msec. The space-average luminance of the targets was kept constant at 10 mL, regardless of contrast, and equal to that of the pre- and post-exposure fields, which contained a cross-hair reticle to help maintain accommodation and fixation. At the longest exposure duration (500 msec) the contrast sensitivity function exhibited both the high- and the low-frequency declines described by previous investigators. At the briefest exposure duration tested (11 msec), the low-frequency decline of contrast sensitivity was virtually absent. Log contrast sensitivity improves with increasing exposure duration, but more for high-frequency than for low-frequency gratings. These results are compatible with the assumption that there is a time delay in the occurrence of inhibitory interactions in the retina.

Citation
JACOB NACHMIAS, "Effect of Exposure Duration on Visual Contrast Sensitivity with Square-Wave Gratings," J. Opt. Soc. Am. 57, 421-427 (1967)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-57-3-421


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