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

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Abstract
The course of dark adaptation in baby chicks is studied after exposure to white adapting light containing different amts. of u.-v. radiation between 280 and 400 m[mu]. Exposure light of wave-lengths longer than 365 m[mu] results in uniform dark adaptation curves. Any addition of u.-v. below 365 m[mu] prevents complete adaptation, raising the final threshold considerably above the normal level. The difference between complete and partial dark adaptation due to exposure to the short waves is proportional to the extent of the u.-v. spectrum. The retardation in dark adaptation after exposure to greater amts. of the u.-v. spectrum is noted only in the latter or rod segment of the curve and it is assumed that the cones are protected by their pigments. When a filter is used which transmits only a small portion of far red and of violet but much of the effective u.-v., the adaptation curve is more rapid at first but very retarded in the rod segment of the curve.

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