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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 38, Iss. 11 — Nov. 1, 1948
  • pp: 971–976

An Illuminant-Stable Color Vision Test II. Experimental-Statistical Evaluation

ELLIS FREEMAN and M. A. ZACCARIA  »View Author Affiliations

JOSA, Vol. 38, Issue 11, pp. 971-976 (1948)

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Previously the physical specifications and the psychophysical requirements were presented for six inks from which an illuminant-stable red-green color vision test could be constructed. The test of 17 polychromatic plates was prepared and administered to 100 color blind and 100 normal subjects under illuminants ranging from minus-blue to 14000°K. The present paper reports the results of the evaluation of the test in actual practice. Theoretical expectations have been realized in that the test is illuminant-stable, discriminatory between normals and deficients, properly varied in relative difficulty of individual plates for normals and for color blinds, yielding scores well distributed in terms of the probability function, and with a minimum of overlapping between normals and color blinds.

ELLIS FREEMAN and M. A. ZACCARIA, "An Illuminant-Stable Color Vision Test II. Experimental-Statistical Evaluation," J. Opt. Soc. Am. 38, 971-976 (1948)

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  1. Ellis Freeman, "An illuminant-stable color vision test. I," J. Opt. Soc. Am. 38, 532 (1948).
  2. D. Farnsworth and J. D. Reed, A Survey of Methods Used in Administering Pseudo-Isochromatic Test Plates for Color Vision, Color Vision Report No. 3 (Bu. Med. x-260 (Av-148-C), Nov. 6, 1943), p. 1.
  3. I. H. Hardy, G. Rand, and M. Rittler, "A screening test for defective red-green vision," J. Opt. Soc. Am. 36, 610 (1946).

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