Abstract

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.

© 1948 Optical Society of America

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References

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  1. Ellis Freeman, “An illuminant-stable color vision test. I,” J. Opt. Soc. Am. 38, 532 (1948).
    [Crossref] [PubMed]
  2. D. Farnsworth and J. D. Reed, A Survey of Methods Used in Administering Pseudo-Isochromatic Test Plates for Color Vision, (Bu. Med. x-260 (Av-148-C), Nov.6, 1943), p. 1.
  3. L. H. Hardy, G. Rand, and M. Rittler, “A screening test for defective red-green vision,” J. Opt. Soc. Am. 36, 610 (1946).
    [Crossref] [PubMed]

1948 (1)

1946 (1)

Farnsworth, D.

D. Farnsworth and J. D. Reed, A Survey of Methods Used in Administering Pseudo-Isochromatic Test Plates for Color Vision, (Bu. Med. x-260 (Av-148-C), Nov.6, 1943), p. 1.

Freeman, Ellis

Hardy, L. H.

Rand, G.

Reed, J. D.

D. Farnsworth and J. D. Reed, A Survey of Methods Used in Administering Pseudo-Isochromatic Test Plates for Color Vision, (Bu. Med. x-260 (Av-148-C), Nov.6, 1943), p. 1.

Rittler, M.

J. Opt. Soc. Am. (2)

Other (1)

D. Farnsworth and J. D. Reed, A Survey of Methods Used in Administering Pseudo-Isochromatic Test Plates for Color Vision, (Bu. Med. x-260 (Av-148-C), Nov.6, 1943), p. 1.

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Figures (2)

Fig. 1
Fig. 1

Frequency distribution of color temperatures in actual and typical testing rooms of the armed forces.

Fig. 2
Fig. 2

Frequency distribution of error scores for color blinds (C) and for normals (N) on abridged (18 plate) AO pseudoisochromatic test and on illuminant-stable (I-S) test.

Tables (3)

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Table I Frequency distributions of maximum differences of error scores under Illuminants II*, III, IV, V* for color blinds (C) and for normals (N) on the AO and the I-S tests.

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Table II Frequency distribution of test-retest differences of error scores under Illuminants I, II, III, IV, V for color blinds (C) and for normals (N) on the AO and I-S tests.

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Table III For the I-S test, frequency of errors for color blinds (C) and for normals (N); the discriminatory power of each plate in terms of r (an r of 0.18 being significant to the 1 percent level of confidence); and the difficulty rank of each plate (1 being the easiest and 17 the hardest). For the frequency of errors the lowest number for the color blinds and the highest for the normals under any one of the five illuminants actually employed was selected to represent each plate. Thus the I-S test is here subjected to the most rigorous and unfavorable conditions.