Abstract

The effect of various sizes of centrally fixated pre-exposures on foveal and peripheral dark adaptation was investigated. For both foveal and peripheral determinations, absolute brightness sensitivity was measured monocularly with a 1-deg circular test patch. Peripheral locations tested were 2, 6, and 15 deg on the horizontal meridian of the temporal retina. Foveal dark-adaptation curves were obtained after pre-exposure to fields which subtended 1, 2.5, 5, 10, and 37.5 deg diam. Peripheral dark-adaptation curves were obtained for three sizes of pre-exposure field at each location. In the fovea, each size was presented at 1 ft-L for 10 sec, 100 ft-L for 10 sec, and 1000 ft-L for 100 sec. In the periphery, each size was presented at 0.1 ft-L for 10 sec and 10 ft-L for 10 sec. The foveal results, with one exception, indicated that size is not a differential factor. In the periphery, the effects of size were most pronounced between those sizes which did and those which did not stimulate the area tested.

© 1960 Optical Society of America

Studies on Dark Adaptation. IV. Pre-Exposure Tolerance of the Dark-Adapted Peripheral Retina*

John A. Hanson, Joseph W. Wulfeck, and Edythe M. S. Anderson
J. Opt. Soc. Am. 50(6) 559-561 (1960)

Studies on Dark Adaptation. VII. Effect of Pre-Exposure Color on Foveal Dark Adaptation*

John A. Hanson and Edythe M. S. Anderson
J. Opt. Soc. Am. 50(10) 965-969 (1960)

Studies on Dark Adaptation. VI. Effects on Foveal Dark Adaptation of Series of Alternating Light and Dark Periods*

John A. Hanson, Edythe M. S. Anderson, and Richard P. Winterberg
J. Opt. Soc. Am. 50(9) 900-902 (1960)

Studies on Dark Adaptation. I. The Pre-Exposure Tolerance of the Dark-Adapted Fovea*

Dorothea E. Johannsen, Patricia I. McBride, and Joseph W. Wulfeck
J. Opt. Soc. Am. 46(1) 67-71 (1956)

Studies on Dark Adaptation. III. Pre-Exposure Tolerance of the Human Fovea as Measured by Contrast Sensitivity*†

Joseph W. Wulfeck, Dorothea E. Johannsen, and Patricia I. McBride
J. Opt. Soc. Am. 50(6) 556-558 (1960)