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EFFECT OF GLARE ON EYE BEHAVIOR DURING GROWTH OF DARK ADAPTATION AND DURING BLACKOUT CONDITIONS
NAVAL RESEARCH LAB WASHINGTON D C
The changes in a red test field are quite different from changes in a blue test field after eye pre-exposures to tungsten and to red illumination. After the threshold of vision is reached, it takes longer for the form of a red test field to be seen by the fovea if the preadaptation is to red illumination than if the pre-exposure is to tungsten illumination, where the form of a red field is seen as soon as the visible threshold is reached. A study of a blue field shows that the rods near the fovea make the field look much brighter near the fovea, thereby increasing the acuity above that at the fovea. The growth of dark adaptation of the eye to colored test fields was obtained by comparing the apparent luminance of a colored test field as seen by the right eye, after it had been pre-exposed to red or to tungsten radiation, to another calibrated variable field of the same color and size as seen by the left unexposed eye. Exposure to red illumination has a smaller effect than an equal exposure to tungsten light anywhere on the retina rods and cones, but the extrafoveal region suffers more than the fovea from either type of preadaptation. The effect on dark adaptation of increasing the intensity of illumination of the preadapting light is to decrease the rate of recovery both at the fovea and elsewhere. Author