Abstract

The decrease in perceived brightness of a foveal test object produced by a peripheral glare source can be accounted for in terms of a veiling luminance produced by stray light falling on the fovea. The same effect can be produced by an artificial patch of veiling luminance superimposed on the test object. The effect of increasing the angle between the glare source and the test object is equivalent to reducing the brightness of the glare source in accordance with the stray light hypothesis. The measured amount of veiling luminance conforms to that found by previous investigators. The changes in brightness that occur immediately following the onset of a peripheral glare source as well as the changes which occur following removal of the glare source can all be accounted for in terms of the veiling luminance produced by stray light falling on the fovea.

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References

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  1. J. F. Schouten and L. S. Ornstein, J. Opt. Soc. Am. 29, 168 (1939).
  2. G. A. Fry and M. Alpern, The effect on foveal vision produced by a spot of light on the sclera near the margin of the retina (to be published).
  3. G. A. Fry and M. Alpern, "The effect of veiling luminance upon the apparent brightness of an object" (to be published).
  4. L. L. Holladay, J. Opt. Soc. Am. 12, 271 (1926).
  5. W. S. Stiles, Proc. Roy. Soc. (London) B104, 322 (1928โ€“1929).
  6. W. S. Stiles and C. Dunbar, Illum. Res. Comm. (Great Britain) Tech. paper No. 16, (1935).
  7. G. A. Fry and M. Alpern, Am. J. Optom. 23, 509 (1946).
  8. B. H. Crawford, Proc. Roy. Soc. (London) B134, 283 (1947).
  9. A. Ivanoff, Rev. optique 26, 479 (1947).
  10. P. Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 444 (1943).
  11. P. Moon and D. E. Spencer, J. Opt. Soc. Am. 35, 233 (1945).

Alpern, M.

G. A. Fry and M. Alpern, The effect on foveal vision produced by a spot of light on the sclera near the margin of the retina (to be published).

G. A. Fry and M. Alpern, "The effect of veiling luminance upon the apparent brightness of an object" (to be published).

G. A. Fry and M. Alpern, Am. J. Optom. 23, 509 (1946).

Crawford, B. H.

B. H. Crawford, Proc. Roy. Soc. (London) B134, 283 (1947).

Dunbar, C.

W. S. Stiles and C. Dunbar, Illum. Res. Comm. (Great Britain) Tech. paper No. 16, (1935).

Fry, G. A.

G. A. Fry and M. Alpern, Am. J. Optom. 23, 509 (1946).

G. A. Fry and M. Alpern, "The effect of veiling luminance upon the apparent brightness of an object" (to be published).

G. A. Fry and M. Alpern, The effect on foveal vision produced by a spot of light on the sclera near the margin of the retina (to be published).

Holladay, L. L.

L. L. Holladay, J. Opt. Soc. Am. 12, 271 (1926).

Ivanoff, A.

A. Ivanoff, Rev. optique 26, 479 (1947).

Moon, P.

P. Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 444 (1943).

P. Moon and D. E. Spencer, J. Opt. Soc. Am. 35, 233 (1945).

Ornstein, L. S.

J. F. Schouten and L. S. Ornstein, J. Opt. Soc. Am. 29, 168 (1939).

Schouten, J. F.

J. F. Schouten and L. S. Ornstein, J. Opt. Soc. Am. 29, 168 (1939).

Spencer, D. E.

P. Moon and D. E. Spencer, J. Opt. Soc. Am. 35, 233 (1945).

P. Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 444 (1943).

Stiles, W. S.

W. S. Stiles, Proc. Roy. Soc. (London) B104, 322 (1928โ€“1929).

W. S. Stiles and C. Dunbar, Illum. Res. Comm. (Great Britain) Tech. paper No. 16, (1935).

Other

J. F. Schouten and L. S. Ornstein, J. Opt. Soc. Am. 29, 168 (1939).

G. A. Fry and M. Alpern, The effect on foveal vision produced by a spot of light on the sclera near the margin of the retina (to be published).

G. A. Fry and M. Alpern, "The effect of veiling luminance upon the apparent brightness of an object" (to be published).

L. L. Holladay, J. Opt. Soc. Am. 12, 271 (1926).

W. S. Stiles, Proc. Roy. Soc. (London) B104, 322 (1928โ€“1929).

W. S. Stiles and C. Dunbar, Illum. Res. Comm. (Great Britain) Tech. paper No. 16, (1935).

G. A. Fry and M. Alpern, Am. J. Optom. 23, 509 (1946).

B. H. Crawford, Proc. Roy. Soc. (London) B134, 283 (1947).

A. Ivanoff, Rev. optique 26, 479 (1947).

P. Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 444 (1943).

P. Moon and D. E. Spencer, J. Opt. Soc. Am. 35, 233 (1945).

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