Abstract

A repetition and extension of L. C. Thomson’s study of the influence of “light history” on the course of dark adaptation has confirmed the finding that a longer time is required to reach stable light adaptation than some writers have stated. The differences in scotopic sensitivity following two conditions of initial adaptation persisted until 15 or 20 min of a second light stimulus had intervened. The course of adaptation to the intervening light can be traced in terms of the time in dark required to reach a given level of sensitivity.

© 1957 Optical Society of America

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References

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  1. L. C. Thomson, J. Physiol. 109, 430–438 (1949).
  2. C. Haig, J. Gen. Physiol. 24, 735–751 (1941).
    [Crossref]
  3. S. Hecht and S. Schlaer, J. Opt. Soc. Am. 28, 269–275 (1938).
    [Crossref]
  4. Smith, Morris, and Dimmick, J. Opt. Soc. Am. 45, 502–506 (1955).
    [Crossref] [PubMed]

1955 (1)

1949 (1)

L. C. Thomson, J. Physiol. 109, 430–438 (1949).

1941 (1)

C. Haig, J. Gen. Physiol. 24, 735–751 (1941).
[Crossref]

1938 (1)

J. Gen. Physiol. (1)

C. Haig, J. Gen. Physiol. 24, 735–751 (1941).
[Crossref]

J. Opt. Soc. Am. (2)

J. Physiol. (1)

L. C. Thomson, J. Physiol. 109, 430–438 (1949).

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Figures (3)

Fig. 1
Fig. 1

Typical dark adaptation curves following different initial adaptation levels and the same critical adaptation times. (Obs SWS.)

Fig. 2
Fig. 2

Influence of light history on dark adaptation. a curves following various critical adaptation periods after two initial levels. Average of three observers. b and c limens after 15, 20, and 30 min in the dark following initial and critical adaptation conditions. (Obs SWS.)

Fig. 3
Fig. 3

Curves of “light adaptation” to the critical level as shown by effect of critical adaptation times on the amount of dark adaptation to reach five sensitivity levels.