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References

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  1. G. Wald, H. Jeghers, and J. Arminio, “An experiment in human dietary night-blindness,” Am. J. Physiol. 123, 732 (1938).
  2. S. Hecht and J. Mandelbaum, “The relation between vitamin A and dark adaptation,” J. Am. Med. Assn. 112, 1910 (1939).
  3. G. Wald and D. Steven, “An experiment in human vitamin A deficiency,” Proc. Nat. Acad. Sci. 25, 344 (1939).
    [Crossref]
  4. R. A. McFarland and W. H. Forbes, “The effects of variations in the concentration of oxygen and of glucose on dark adaptation,” J. Gen. Physiol. 24, 69 (1940–41).
    [Crossref]
  5. Cf. reference 2. S. Hecht and S. Shlaer, “An adaptometer for measuring human dark adaptation,” J. Opt. Soc. Am. 28, 269 (1938).
    [Crossref]
  6. D. Steven and G. Wald, “Vitamin A deficiency: a field study in Newfoundland and Labrador,” J. Nutrition, in press.

1939 (2)

S. Hecht and J. Mandelbaum, “The relation between vitamin A and dark adaptation,” J. Am. Med. Assn. 112, 1910 (1939).

G. Wald and D. Steven, “An experiment in human vitamin A deficiency,” Proc. Nat. Acad. Sci. 25, 344 (1939).
[Crossref]

1938 (2)

Cf. reference 2. S. Hecht and S. Shlaer, “An adaptometer for measuring human dark adaptation,” J. Opt. Soc. Am. 28, 269 (1938).
[Crossref]

G. Wald, H. Jeghers, and J. Arminio, “An experiment in human dietary night-blindness,” Am. J. Physiol. 123, 732 (1938).

Arminio, J.

G. Wald, H. Jeghers, and J. Arminio, “An experiment in human dietary night-blindness,” Am. J. Physiol. 123, 732 (1938).

Forbes, W. H.

R. A. McFarland and W. H. Forbes, “The effects of variations in the concentration of oxygen and of glucose on dark adaptation,” J. Gen. Physiol. 24, 69 (1940–41).
[Crossref]

Hecht, S.

S. Hecht and J. Mandelbaum, “The relation between vitamin A and dark adaptation,” J. Am. Med. Assn. 112, 1910 (1939).

Cf. reference 2. S. Hecht and S. Shlaer, “An adaptometer for measuring human dark adaptation,” J. Opt. Soc. Am. 28, 269 (1938).
[Crossref]

Jeghers, H.

G. Wald, H. Jeghers, and J. Arminio, “An experiment in human dietary night-blindness,” Am. J. Physiol. 123, 732 (1938).

Mandelbaum, J.

S. Hecht and J. Mandelbaum, “The relation between vitamin A and dark adaptation,” J. Am. Med. Assn. 112, 1910 (1939).

McFarland, R. A.

R. A. McFarland and W. H. Forbes, “The effects of variations in the concentration of oxygen and of glucose on dark adaptation,” J. Gen. Physiol. 24, 69 (1940–41).
[Crossref]

Shlaer, S.

Steven, D.

G. Wald and D. Steven, “An experiment in human vitamin A deficiency,” Proc. Nat. Acad. Sci. 25, 344 (1939).
[Crossref]

D. Steven and G. Wald, “Vitamin A deficiency: a field study in Newfoundland and Labrador,” J. Nutrition, in press.

Wald, G.

G. Wald and D. Steven, “An experiment in human vitamin A deficiency,” Proc. Nat. Acad. Sci. 25, 344 (1939).
[Crossref]

G. Wald, H. Jeghers, and J. Arminio, “An experiment in human dietary night-blindness,” Am. J. Physiol. 123, 732 (1938).

D. Steven and G. Wald, “Vitamin A deficiency: a field study in Newfoundland and Labrador,” J. Nutrition, in press.

Am. J. Physiol. (1)

G. Wald, H. Jeghers, and J. Arminio, “An experiment in human dietary night-blindness,” Am. J. Physiol. 123, 732 (1938).

J. Am. Med. Assn. (1)

S. Hecht and J. Mandelbaum, “The relation between vitamin A and dark adaptation,” J. Am. Med. Assn. 112, 1910 (1939).

J. Gen. Physiol. (1)

R. A. McFarland and W. H. Forbes, “The effects of variations in the concentration of oxygen and of glucose on dark adaptation,” J. Gen. Physiol. 24, 69 (1940–41).
[Crossref]

J. Opt. Soc. Am. (1)

Proc. Nat. Acad. Sci. (1)

G. Wald and D. Steven, “An experiment in human vitamin A deficiency,” Proc. Nat. Acad. Sci. 25, 344 (1939).
[Crossref]

Other (1)

D. Steven and G. Wald, “Vitamin A deficiency: a field study in Newfoundland and Labrador,” J. Nutrition, in press.

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Figures (3)

Fig. 1
Fig. 1

Adaptometer mounted for stationary use. The test unit is clamped on a burette stand. In this instance the subject (left) operates the shutter-plunger, while the operator adjusts the brightness-dial. When not in use the eyepiece is detached, and the test unit and cord are replaced in the cabinet through the door shown in its side.

Fig. 2A
Fig. 2A

Sagittal section of the test unit: c, channel for eyepiece and diaphragms; f, fixation lamp; o, opal glass screen; s, shutter; t, test lamp. B. The diaphragms, drawn to half the scale of A: (a) for field size and position; (b) to hold 1-inch square filters; (c) the back of the eyepiece. C. Top view of the eyepiece, drawn to half the scale of A. D. The circuit: b, storage cells; s, on-off switch; r1, rheostat, and v, voltmeter, for setting the line voltage; r2, calibrated rheostat for regulating the brightness of f, the fixation lamp, and t, the test lamp.

Fig. 3
Fig. 3

Dark adaptation following 4 minutes exposure to 2940 millilamberts. Each point represents a single reading of the threshold. Open circles: data of one monocular experiment, displaced 1 log unit upward. Solid circles: data of four binocular experiments on different days. Thresholds in millimicrolamberts (10−6 millilambert). Field 2° in diameter, centered 6° below the fixation point, 1/50 second test flashes.