Abstract

Luminance thresholds for the visual resolution of various widths of alternating light and dark lines were determined at various times during dark adaptation. The finest gratings, representing high degrees of visual acuity, show only a single cone curve that drops from a high luminance threshold during the first moments of dark adaptation to a final steady level that is reached after about 7 to 10 minutes in the dark. Coarse gratings produce a duplex curve that shows an initial cone portion and a delayed rod portion. Visual acuity is a parameter that sets the position of a given curve on the log threshold axis. The higher the degree of resolution required, the higher the dark adaptation threshold. At a constant grating luminance, visual acuity rises rapidly to a maximum during dark adaptation; the higher the luminance, the earlier and more rapid the rise and the higher the maximum. Visual acuity increases at all dark adaptation times with increase in luminance.

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  1. G. Wald and A. B. Clark, J. Gen. Physiol. 21, 93 (1937).
  2. D. E. Johannsen, J. Gen. Psychol. 10, 4 (1934).
  3. Hecht, Haig, and Chase, J. Gen. Physiol. 20, 831 (1937).
  4. C. P. Winsor and A. B. Clark, Proc. Natl. Acad. Sci. 22, 400 (1936).
  5. Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 584 (1950).
  6. Graham, Brown, and Mote, J. Exptl. Psychol. 24, 555 (1939).
  7. S. Hecht, Physiol. Rev. 17, 239 (1937).
  8. C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935).
  9. E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 40, 211 (1950).
  10. An experiment similar to the experiment herein reported came to the attention of the authors while this manuscript was in press: A. J. Marshall and R. H. Day, Australian J. Psychol. 3, 1 (1951). Discussion of this experiment will be presented in a subsequent report dealing with the effects of different preadapting luminances.
  11. S. Shlaer, J. Gen. Physiol. 21, 165 (1937).
  12. S. Hecht and S. Shlaer, J. Opt. Soc. Am. 28, 269 (1938).

Clark, A. B.

C. P. Winsor and A. B. Clark, Proc. Natl. Acad. Sci. 22, 400 (1936).

G. Wald and A. B. Clark, J. Gen. Physiol. 21, 93 (1937).

Day, R. H.

An experiment similar to the experiment herein reported came to the attention of the authors while this manuscript was in press: A. J. Marshall and R. H. Day, Australian J. Psychol. 3, 1 (1951). Discussion of this experiment will be presented in a subsequent report dealing with the effects of different preadapting luminances.

Graham, C. H.

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935).

Hecht, S.

S. Hecht, Physiol. Rev. 17, 239 (1937).

S. Hecht and S. Shlaer, J. Opt. Soc. Am. 28, 269 (1938).

Johannsen, D. E.

D. E. Johannsen, J. Gen. Psychol. 10, 4 (1934).

Margaria, R.

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935).

Marshall, A. J.

An experiment similar to the experiment herein reported came to the attention of the authors while this manuscript was in press: A. J. Marshall and R. H. Day, Australian J. Psychol. 3, 1 (1951). Discussion of this experiment will be presented in a subsequent report dealing with the effects of different preadapting luminances.

Shlaer, S.

S. Shlaer, J. Gen. Physiol. 21, 165 (1937).

S. Hecht and S. Shlaer, J. Opt. Soc. Am. 28, 269 (1938).

Wald, G.

G. Wald and A. B. Clark, J. Gen. Physiol. 21, 93 (1937).

Winsor, C. P.

C. P. Winsor and A. B. Clark, Proc. Natl. Acad. Sci. 22, 400 (1936).

Wolf, E.

E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 40, 211 (1950).

Zigler, M. J.

E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 40, 211 (1950).

Other (12)

G. Wald and A. B. Clark, J. Gen. Physiol. 21, 93 (1937).

D. E. Johannsen, J. Gen. Psychol. 10, 4 (1934).

Hecht, Haig, and Chase, J. Gen. Physiol. 20, 831 (1937).

C. P. Winsor and A. B. Clark, Proc. Natl. Acad. Sci. 22, 400 (1936).

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 584 (1950).

Graham, Brown, and Mote, J. Exptl. Psychol. 24, 555 (1939).

S. Hecht, Physiol. Rev. 17, 239 (1937).

C. H. Graham and R. Margaria, Am. J. Physiol. 113, 299 (1935).

E. Wolf and M. J. Zigler, J. Opt. Soc. Am. 40, 211 (1950).

An experiment similar to the experiment herein reported came to the attention of the authors while this manuscript was in press: A. J. Marshall and R. H. Day, Australian J. Psychol. 3, 1 (1951). Discussion of this experiment will be presented in a subsequent report dealing with the effects of different preadapting luminances.

S. Shlaer, J. Gen. Physiol. 21, 165 (1937).

S. Hecht and S. Shlaer, J. Opt. Soc. Am. 28, 269 (1938).

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