Abstract

The photopic luminosity function for fifteen Egyptian observers with normal color vision has been measured every 100A between 0.41µ and 0.46µ by the direct comparison method and between 0.46µ and 0.70µ by the flicker technique on Wright’s colorimeter. Two humps at about 0.45µ and 0.48µ have been noticed but are more pronounced than those found by previous investigators. An analysis of the present data and the more important previous investigations has been made. It was found that the discrepancies among the different results could be partly accounted for by differences in the observational conditions and differences in the densities of the yellow macular pigmentation among the observers. The results also confirm Jacobsen’s finding that the C.I.E. luminosity function is low at the blue end of the spectrum.

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  1. G. Wald, Science 101, 653 (1945).
  2. A. E. Jacobsen, J. Opt. Soc. Am. 38, 442 (1948).
  3. D. B. Judd, J. Opt. Soc. Am. 39, 278 (1949) and J. Research Natl. Bur. Standards 43, 227 (1949).
  4. L. C. Thomson, Proc. Phys. Soc. (London) B62, 787 (1949).
  5. K. S. Weaver, J. Opt. Soc. Am. 39, 278 (1949).
  6. K. S. Gibson and E. P. T. Tyndall, Sci. Papers Bur. Standards 19, 131, S475 (1923).
  7. W. D. Wright, Researches on Normal and Defective Colour Vision (Henry Kimpton, London, 1946).
  8. I. G. H. Ishak, "A Study of Colour Vision Characteristics of Egyptian Trichromats," Ph.D. thesis (London University, 1950).
  9. P. Jainski, Diss. Tech. Hochschule (Berlin, 1938).
  10. J. H. Nelson, Proc. Phys. Soc. (London) 49, 332 (1937).
  11. W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).
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  14. H. E. Ives, Phil. Mag. 6, 853 (1912).
  15. P. G. Nutting, J. Opt. Soc. Am. 4, 58 (1920).
  16. H. V. Walters and W. D. Wright, Proc. Roy. Soc. (London) B131, 340 (1943).
  17. K. S. Gibson, J. Opt. Soc. Am. 30, 51 (1940).
  18. S. L. Polyak, The Retina (University of Chicago Press, Chicago, 1941).
  19. R. Granit, Sensory Mechanisms of the Retina (Oxford University Press, London, 1947).
  20. H. J. Dartnall, Brit. J. Ophthalmol. 793 (November, 1948).
  21. L. C. Thomson, J. Physiol. (1950) (to be published).
  22. G. Wald, Documenta Ophthalmol. 3, 94 (1949).
  23. W. S. Stiles and B. H. Crawford, Proc. Roy. Soc. (London) B113, 496 (1933).

Coblentz, W. W.

W. W. Coblentz and W. B. Emerson, Sci. Papers Bur. Standards No. 303, 219 (1917).

Crawford, B. H.

W. S. Stiles and B. H. Crawford, Proc. Roy. Soc. (London) B113, 496 (1933).

Dartnall, H. J.

H. J. Dartnall, Brit. J. Ophthalmol. 793 (November, 1948).

Emerson, W. B.

W. W. Coblentz and W. B. Emerson, Sci. Papers Bur. Standards No. 303, 219 (1917).

Gibson, K. S.

K. S. Gibson, J. Opt. Soc. Am. 30, 51 (1940).

K. S. Gibson and E. P. T. Tyndall, Sci. Papers Bur. Standards 19, 131, S475 (1923).

Granit, R.

R. Granit, Sensory Mechanisms of the Retina (Oxford University Press, London, 1947).

Ishak, I. G. H.

I. G. H. Ishak, "A Study of Colour Vision Characteristics of Egyptian Trichromats," Ph.D. thesis (London University, 1950).

Ives, H. E.

H. E. Ives, Phil. Mag. 6, 853 (1912).

Jacobsen, A. E.

A. E. Jacobsen, J. Opt. Soc. Am. 38, 442 (1948).

Jainski, P.

P. Jainski, Diss. Tech. Hochschule (Berlin, 1938).

Judd, D. B.

D. B. Judd, J. Opt. Soc. Am. 39, 278 (1949) and J. Research Natl. Bur. Standards 43, 227 (1949).

Nelson, J. H.

J. H. Nelson, Proc. Phys. Soc. (London) 49, 332 (1937).

Nutting, P. G.

P. G. Nutting, J. Opt. Soc. Am. 4, 58 (1920).

Pitt, F. H. G.

W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).

Polyak, S. L.

S. L. Polyak, The Retina (University of Chicago Press, Chicago, 1941).

Stiles, W. S.

W. S. Stiles and B. H. Crawford, Proc. Roy. Soc. (London) B113, 496 (1933).

Thomson, L. C.

L. C. Thomson, Proc. Phys. Soc. (London) B62, 787 (1949).

L. C. Thomson, J. Physiol. (1950) (to be published).

Tyndall, E. P. T.

K. S. Gibson and E. P. T. Tyndall, Sci. Papers Bur. Standards 19, 131, S475 (1923).

Wald, G.

G. Wald, Documenta Ophthalmol. 3, 94 (1949).

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

Walters, H. V.

H. V. Walters and W. D. Wright, Proc. Roy. Soc. (London) B131, 340 (1943).

Weaver, K. S.

K. S. Weaver, J. Opt. Soc. Am. 39, 278 (1949).

Wright, W. D.

W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).

H. V. Walters and W. D. Wright, Proc. Roy. Soc. (London) B131, 340 (1943).

W. D. Wright, Researches on Normal and Defective Colour Vision (Henry Kimpton, London, 1946).

Other (23)

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

A. E. Jacobsen, J. Opt. Soc. Am. 38, 442 (1948).

D. B. Judd, J. Opt. Soc. Am. 39, 278 (1949) and J. Research Natl. Bur. Standards 43, 227 (1949).

L. C. Thomson, Proc. Phys. Soc. (London) B62, 787 (1949).

K. S. Weaver, J. Opt. Soc. Am. 39, 278 (1949).

K. S. Gibson and E. P. T. Tyndall, Sci. Papers Bur. Standards 19, 131, S475 (1923).

W. D. Wright, Researches on Normal and Defective Colour Vision (Henry Kimpton, London, 1946).

I. G. H. Ishak, "A Study of Colour Vision Characteristics of Egyptian Trichromats," Ph.D. thesis (London University, 1950).

P. Jainski, Diss. Tech. Hochschule (Berlin, 1938).

J. H. Nelson, Proc. Phys. Soc. (London) 49, 332 (1937).

W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 47, 205 (1935).

Hyde, Forsythe, and Cady, Astrophys. J. 48, 65 (1918).

W. W. Coblentz and W. B. Emerson, Sci. Papers Bur. Standards No. 303, 219 (1917).

H. E. Ives, Phil. Mag. 6, 853 (1912).

P. G. Nutting, J. Opt. Soc. Am. 4, 58 (1920).

H. V. Walters and W. D. Wright, Proc. Roy. Soc. (London) B131, 340 (1943).

K. S. Gibson, J. Opt. Soc. Am. 30, 51 (1940).

S. L. Polyak, The Retina (University of Chicago Press, Chicago, 1941).

R. Granit, Sensory Mechanisms of the Retina (Oxford University Press, London, 1947).

H. J. Dartnall, Brit. J. Ophthalmol. 793 (November, 1948).

L. C. Thomson, J. Physiol. (1950) (to be published).

G. Wald, Documenta Ophthalmol. 3, 94 (1949).

W. S. Stiles and B. H. Crawford, Proc. Roy. Soc. (London) B113, 496 (1933).

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