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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: 416–420

Spectral-Sensitivity Functions for Homochromatic-Contrast Detection

DWIGHT A. BURKHARDT and PAUL WHITTLE  »View Author Affiliations


JOSA, Vol. 57, Issue 3, pp. 416-420 (1967)
http://dx.doi.org/10.1364/JOSA.57.000416


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Abstract

Two methods of measuring foveal spectral sensitivity were compared: (1) the absolute-threshold method and (2) a homochromatic-contrast method. In the second method, the subject saw a fixed-contrast homochromatic stimulus consisting of a steady background field and a superimposed 32% increment flash. The overall radiance level of the stimulus was varied systematically to determine the minimum radiance required to detect the flash. The spectral-sensitivity curve obtained by this method was somewhat narrower than the curve obtained by the absolute-threshold method. The homochromatic-contrast method was also used for a retinal region 8° above the fovea. A curve resembling the common photopic curve was obtained. It is concluded that the homochromatic-contrast method may serve as a useful addition to the standard methods of spectral-sensitivity measurement.

Citation
DWIGHT A. BURKHARDT and PAUL WHITTLE, "Spectral-Sensitivity Functions for Homochromatic-Contrast Detection," J. Opt. Soc. Am. 57, 416-420 (1967)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-57-3-416


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References

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  19. It would be of interest to compare the extrafoveal results of the dark-adaptation method with those of the contrast-detection method, using the same subjects, to see if the relation between the two extrafoveal curves is the same as that found between the two types of foveal curves. This is in fact the case for a comparison across subjects which can be made with our parafoveal curves and the 8° parafoveal curve obtained by Wald13 with the dark-adaptation method.

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