Abstract

The effects of hue and of different durations of exposure to hue on the course of dark adaptation were determined by having ten males wear goggles which contained either red, green, or blue filters. All subjects were exposed for durations of 2, 3.5, 5, and 10 minutes to a randomly selected hue before similar exposures to the other hues. The lengths of time required to see 15 predetermined luminance levels in a Hecht-type Adaptometer were recorded after each exposure. A trend analysis of the resulting dark adaptation curves indicated that only the curves following exposure to blue are parallel. All the curves are significantly different between adaptation levels. Blue has the least effect on dark adaptation, with red having the most and green falling between the two, but about the same as red in effectiveness at the lowest luminance values. Exposure to either red or green for three and a half to five minutes is the most effective duration for dark adaptation to the lowest luminance values. The dark adaptation curves following exposure to red have steeper slopes but level off and reach the lowest luminance values in the same time as the curves following exposure to green.

© 1956 Optical Society of America

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