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.

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  1. W. S. Stiles, Proc. Natl. Acad. Sci. 45, 100 (1959).
  2. G. G. Heath, Science 128, 775 (1958).
  3. E. P. Johnson, L. A. Riggs, and A. M. L. Schick, in Clinical Electroretinography Supplement to Vision Research, Ed. by H. M. Burian and J. H. Jacobson (Pergamon Press, London, New York, 1966), p. 75.
  4. W. S. Stiles, Proc. Roy. Soc. (London) 127-B, 64 (1937).
  5. S. Hecht, J. C. Peskin, and M. Patt, J. Gen. Physiol. 22, 7 (1938).
  6. D. Dillon and R. T. Zegers, J. Opt. Soc. Am. 48, 877 (1958).
  7. Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 38, 80 (1952).
  8. L. M. Hurvich and D. Jameson, J. Opt. Soc. Am. 43, 485 (1953).
  9. H. G. Sperling and W. G. Lewis, J. Opt. Soc. Am. 49, 983 (1959).
  10. H. G. Sperling and Y. Hsia, J. Opt. Soc. Am. 47, 707 (1957).
  11. W. S. Stiles, Proc. Phys. Soc. (London) 58, 329 (1944).
  12. L. C. Thomson, J. Physiol. 112, 114 (1951).
  13. G. Wald, Science 101, 653 (1945).
  14. G. Wald, Science 145, 1007 (1964).
  15. W. D. Wright, J. Opt. Soc. Am. 42, 509 (1952).
  16. S. Guth, J. Opt. Soc. Am. 55, 718 (1965).
  17. R. M. Boynton, M. Ikeda, and W. S. Stiles, Vision Res. 4, 87 (1964).
  18. R. M. Boynton, S. R. Das, and J. Gardiner, J. Opt. Soc. Am. 56, 539 (1966).
  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.

Boynton, R. M.

R. M. Boynton, M. Ikeda, and W. S. Stiles, Vision Res. 4, 87 (1964).

R. M. Boynton, S. R. Das, and J. Gardiner, J. Opt. Soc. Am. 56, 539 (1966).

Das, S. R.

R. M. Boynton, S. R. Das, and J. Gardiner, J. Opt. Soc. Am. 56, 539 (1966).

Dillon, D.

D. Dillon and R. T. Zegers, J. Opt. Soc. Am. 48, 877 (1958).

Gardiner, J.

R. M. Boynton, S. R. Das, and J. Gardiner, J. Opt. Soc. Am. 56, 539 (1966).

Graham, C. H.

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 38, 80 (1952).

Guth, S.

S. Guth, J. Opt. Soc. Am. 55, 718 (1965).

Heath, G. G.

G. G. Heath, Science 128, 775 (1958).

Hecht, S.

S. Hecht, J. C. Peskin, and M. Patt, J. Gen. Physiol. 22, 7 (1938).

Hsia, Y.

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 38, 80 (1952).

H. G. Sperling and Y. Hsia, J. Opt. Soc. Am. 47, 707 (1957).

Hurvich, L. M.

L. M. Hurvich and D. Jameson, J. Opt. Soc. Am. 43, 485 (1953).

Ikeda, M.

R. M. Boynton, M. Ikeda, and W. S. Stiles, Vision Res. 4, 87 (1964).

Jameson, D.

L. M. Hurvich and D. Jameson, J. Opt. Soc. Am. 43, 485 (1953).

Johnson, E. P.

E. P. Johnson, L. A. Riggs, and A. M. L. Schick, in Clinical Electroretinography Supplement to Vision Research, Ed. by H. M. Burian and J. H. Jacobson (Pergamon Press, London, New York, 1966), p. 75.

Lewis, W. G.

H. G. Sperling and W. G. Lewis, J. Opt. Soc. Am. 49, 983 (1959).

Patt, M.

S. Hecht, J. C. Peskin, and M. Patt, J. Gen. Physiol. 22, 7 (1938).

Peskin, J. C.

S. Hecht, J. C. Peskin, and M. Patt, J. Gen. Physiol. 22, 7 (1938).

Riggs, L. A.

E. P. Johnson, L. A. Riggs, and A. M. L. Schick, in Clinical Electroretinography Supplement to Vision Research, Ed. by H. M. Burian and J. H. Jacobson (Pergamon Press, London, New York, 1966), p. 75.

Schick, A. M. L.

E. P. Johnson, L. A. Riggs, and A. M. L. Schick, in Clinical Electroretinography Supplement to Vision Research, Ed. by H. M. Burian and J. H. Jacobson (Pergamon Press, London, New York, 1966), p. 75.

Sperling, H. G.

H. G. Sperling and Y. Hsia, J. Opt. Soc. Am. 47, 707 (1957).

H. G. Sperling and W. G. Lewis, J. Opt. Soc. Am. 49, 983 (1959).

Stiles, W. S.

W. S. Stiles, Proc. Roy. Soc. (London) 127-B, 64 (1937).

W. S. Stiles, Proc. Natl. Acad. Sci. 45, 100 (1959).

R. M. Boynton, M. Ikeda, and W. S. Stiles, Vision Res. 4, 87 (1964).

W. S. Stiles, Proc. Phys. Soc. (London) 58, 329 (1944).

Thomson, L. C.

L. C. Thomson, J. Physiol. 112, 114 (1951).

Wald, G.

G. Wald, Science 101, 653 (1945).

G. Wald, Science 145, 1007 (1964).

Wright, W. D.

W. D. Wright, J. Opt. Soc. Am. 42, 509 (1952).

Zegers, R. T.

D. Dillon and R. T. Zegers, J. Opt. Soc. Am. 48, 877 (1958).

Other (19)

W. S. Stiles, Proc. Natl. Acad. Sci. 45, 100 (1959).

G. G. Heath, Science 128, 775 (1958).

E. P. Johnson, L. A. Riggs, and A. M. L. Schick, in Clinical Electroretinography Supplement to Vision Research, Ed. by H. M. Burian and J. H. Jacobson (Pergamon Press, London, New York, 1966), p. 75.

W. S. Stiles, Proc. Roy. Soc. (London) 127-B, 64 (1937).

S. Hecht, J. C. Peskin, and M. Patt, J. Gen. Physiol. 22, 7 (1938).

D. Dillon and R. T. Zegers, J. Opt. Soc. Am. 48, 877 (1958).

Y. Hsia and C. H. Graham, Proc. Natl. Acad. Sci. 38, 80 (1952).

L. M. Hurvich and D. Jameson, J. Opt. Soc. Am. 43, 485 (1953).

H. G. Sperling and W. G. Lewis, J. Opt. Soc. Am. 49, 983 (1959).

H. G. Sperling and Y. Hsia, J. Opt. Soc. Am. 47, 707 (1957).

W. S. Stiles, Proc. Phys. Soc. (London) 58, 329 (1944).

L. C. Thomson, J. Physiol. 112, 114 (1951).

G. Wald, Science 101, 653 (1945).

G. Wald, Science 145, 1007 (1964).

W. D. Wright, J. Opt. Soc. Am. 42, 509 (1952).

S. Guth, J. Opt. Soc. Am. 55, 718 (1965).

R. M. Boynton, M. Ikeda, and W. S. Stiles, Vision Res. 4, 87 (1964).

R. M. Boynton, S. R. Das, and J. Gardiner, J. Opt. Soc. Am. 56, 539 (1966).

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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