Effects of Exposure to Ultra-Violet Light on Human Dark Adaptation

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Abstract
The course of dark adaptation of the human eye is studied after preexposure to the radiation of a Hg vapor lamp, filtering out the u.-v. between 290 m[mu] and the visible to various extents. Exposure to light free from u.-v. results in uniform dark adaptation curves. Addition of ultra-violet below 365 m[mu] affects rod adaptation by causing a later onset of rod adaptation and raising the final thresholds appreciably above the normal level. The cone adaptation is not affected. The final level reached is a function of the extent of the ultra-violet spectrum. The lens, having a high u.-v. absorption, reduces the u.-v. action upon the retina which can be demonstrated on aphakic eyes in which the u.-v. action on dark adaptation is considerably increased.

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