Abstract

The influence of intermittent versus continuous preadaptation upon subsequent dark adaptation was investigated for two durations of the continuous: 112 and 3 minutes. The rate of intermittence for the discontinuous condition was 1 cycle/second and four light-to-dark ratios were employed. The pre-exposure intensities were 8860, 886, 88.6, and 8.86 mL. Differences were found for most of the cases in which a comparison was made between the curves of dark adaptation following the two conditions of preadaptation. For the intermittent condition at the highest pre-exposure intensity it was found that the shorter the light-time in the ratio, the lower the initial threshold tended to be and the more rapidly the final dark adapted threshold was reached. At the two lower intensities the initial thresholds for both the intermittent and continuous curves were approximately the same, but the curves for the intermittent were markedly retarded in reaching the final level of dark adaptation.

© 1952 Optical Society of America

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References

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  1. F. A. Mote and A. J. Riopelle, J. Opt. Soc. Am. 41, 120 (1951).
    [Crossref]
  2. Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).
  3. G. Wald, Science 113, 287 (1951).
    [Crossref] [PubMed]
  4. G. Wald and A-B. Clark, J. Gen. Physiol. 21, 93 (1937).

1951 (2)

1950 (1)

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

1937 (1)

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

Clark, A-B.

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

Meyer,

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Mote,

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Mote, F. A.

Riopelle,

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Riopelle, A. J.

Wald, G.

G. Wald, Science 113, 287 (1951).
[Crossref] [PubMed]

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

J. Gen. Physiol. (1)

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

J. Opt. Soc. Am. (2)

F. A. Mote and A. J. Riopelle, J. Opt. Soc. Am. 41, 120 (1951).
[Crossref]

Mote, Riopelle, and Meyer, J. Opt. Soc. Am. 40, 585 (1950).

Science (1)

G. Wald, Science 113, 287 (1951).
[Crossref] [PubMed]

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Figures (4)

Fig. 1
Fig. 1

Dark adaptation curves obtained after pre-exposure to 8860 mL for both continuous and intermittent light. The line has been drawn by inspection through the points for the continuous control procedures. The dots are for the threshold values obtained after intermittent stimulation at various light-dark ratios. The curves in the left-hand panel are for 1 1 2 -minutes duration of the control continuous pre-exposure, those on the right for 3-minutes duration of the control. The light-dark ratios are shown for each pair of curves. The data are for the two subjects.

Fig. 2
Fig. 2

Dark adaptation curves obtained after pre-exposure to 886 mL for both continuous and intermittent light. The meanings of the various symbols are the same as for Fig. 1.

Fig. 3
Fig. 3

Dark adaptation curves obtained after pre-exposure to 88.6 mL for both continuous and intermittent light. The meanings of the various symbols are the same as for Fig. 1.

Fig. 4
Fig. 4

Dark adaptation curves obtained after pre-exposure to 8.86 mL for both continuous and intermittent light. The meanings of the various symbols are the same as for Fig. 1.

Tables (2)

Tables Icon

Table I Values in log micromicrolamberts of the first threshold measurements taken after the exposure light was turned off. The entries are for two subjects, for two durations of the control pre-exposure, and for both the experimental and control procedures. The asterisks indicate that no measurement was obtained at “zero” time in the dark. “Int.” refers to the values obtained after intermittent pre-exposure, “cont.” to the same for the continuous.

Tables Icon

Table II Differences (control procedure initial threshold value in log micromicrolamberts—minus—experimental procedure initial threshold value in log micromicrolamberts) for all light-dark ratios and pre-exposure intensities. The asterisks have the same meaning as in Table I.