Abstract

Binocular brightness matches in eight spectral regions, ranging from one having a spectral centroid at 452 mμ to one with a spectral centroid at 681 mμ, were determined for a unilaterally dichromatic subject, a young woman with normal color vision in one eye and basically deuteranopic vision in the other. The measurements were made at photopic luminance levels by means of a polarization photometer in which the field of view of each eye subtended 1.8°.

For a report of apparent equality of brightness of the two test fields, the luminance requirements for the field seen by the subject’s color-blind eye exceed those for the field viewed by her normal eye in all but the red spectral regions. The luminance loss varies with wavelength; it is greatest in the green, less in the blue, and even less in the yellow. These selective spectral luminosity losses are maintained over a luminance range of approximately 2.5 log millilamberts. These data confirm earlier findings on selective luminosity losses at threshold for this subject’s deuteranopic eye.

© 1958 Optical Society of America

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References

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  1. F. H. G. Pitt, (1935).
  2. S. Hecht and Y. Hsia, J. Gen. Physiol. 31, 141 (1947).
  3. Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 43, 1011 (1957).
    [Crossref]
  4. C. H. Graham and Y. Hsia, Proc. Natl. Acad. Sci. 44, 46 (1958).
    [Crossref]
  5. Berger, Graham, and Hsia, J. Opt. Soc. Am. 48, 614 (1958).
    [Crossref] [PubMed]
  6. S. Hecht, Handbook of General and Experimental Psychology, edited by Murchison (Clark University Press, Worcester, Massachusetts, 1934).
  7. F. H. G. Pitt, Proc. Roy. Soc. (London) 132, 101 (1944); G. L. Walls and R. W. Mathews, “New means of studying color blindness and normal foveal color vision,” University of California Publications, Psychology 7, No. 1 (1952).
    [Crossref]

1958 (2)

C. H. Graham and Y. Hsia, Proc. Natl. Acad. Sci. 44, 46 (1958).
[Crossref]

Berger, Graham, and Hsia, J. Opt. Soc. Am. 48, 614 (1958).
[Crossref] [PubMed]

1957 (1)

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 43, 1011 (1957).
[Crossref]

1947 (1)

S. Hecht and Y. Hsia, J. Gen. Physiol. 31, 141 (1947).

1944 (1)

F. H. G. Pitt, Proc. Roy. Soc. (London) 132, 101 (1944); G. L. Walls and R. W. Mathews, “New means of studying color blindness and normal foveal color vision,” University of California Publications, Psychology 7, No. 1 (1952).
[Crossref]

Berger,

Graham,

Graham, C. H.

C. H. Graham and Y. Hsia, Proc. Natl. Acad. Sci. 44, 46 (1958).
[Crossref]

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 43, 1011 (1957).
[Crossref]

Hecht, S.

S. Hecht and Y. Hsia, J. Gen. Physiol. 31, 141 (1947).

S. Hecht, Handbook of General and Experimental Psychology, edited by Murchison (Clark University Press, Worcester, Massachusetts, 1934).

Hsia,

Hsia, Y.

C. H. Graham and Y. Hsia, Proc. Natl. Acad. Sci. 44, 46 (1958).
[Crossref]

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 43, 1011 (1957).
[Crossref]

S. Hecht and Y. Hsia, J. Gen. Physiol. 31, 141 (1947).

Pitt, F. H. G.

F. H. G. Pitt, Proc. Roy. Soc. (London) 132, 101 (1944); G. L. Walls and R. W. Mathews, “New means of studying color blindness and normal foveal color vision,” University of California Publications, Psychology 7, No. 1 (1952).
[Crossref]

F. H. G. Pitt, (1935).

J. Gen. Physiol. (1)

S. Hecht and Y. Hsia, J. Gen. Physiol. 31, 141 (1947).

J. Opt. Soc. Am. (1)

Proc. Natl. Acad. Sci. (2)

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 43, 1011 (1957).
[Crossref]

C. H. Graham and Y. Hsia, Proc. Natl. Acad. Sci. 44, 46 (1958).
[Crossref]

Proc. Roy. Soc. (London) (1)

F. H. G. Pitt, Proc. Roy. Soc. (London) 132, 101 (1944); G. L. Walls and R. W. Mathews, “New means of studying color blindness and normal foveal color vision,” University of California Publications, Psychology 7, No. 1 (1952).
[Crossref]

Other (2)

F. H. G. Pitt, (1935).

S. Hecht, Handbook of General and Experimental Psychology, edited by Murchison (Clark University Press, Worcester, Massachusetts, 1934).

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Figures (2)

Fig. 1
Fig. 1

Diagram of the apparatus as described in text.

Fig. 2
Fig. 2

Binocular brightness matches of a unilateral deuteranope in various spectral regions. Each datum point represents the luminances of the test fields seen by their respective eyes when the fields are equated for brightness by the subject.

Tables (2)

Tables Icon

Table I Luminances required by the right (normal) and left (color-blind), eyes of a unilateral deuteranope for binocular brightness matches at various wavelengths.

Tables Icon

Table II Average valuea by which log luminance requirements for the color-blind eye exceed corresponding log luminances for the normal eye in the binocular brightness matches of a unilateral deuteranope at various wavelengths.

Equations (1)

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λ c = E λ V λ T λ λ E λ V λ T λ ,