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Article
March 1975

Ultraviolet Light Therapy for Psoriasis

Arch Dermatol. 1975;111(3):397. doi:10.1001/archderm.1975.01630150117023
Abstract

To the Editor.—  In the April 1974 issue of the Archives, Drs. Stern and Kihiczak reported the results of their attempts to determine the action spectrum of ultraviolet light-induced clearing of psoriasis (109:502, 1974). Using a xenon arc solar simulator and a cold quartz lamp, the authors compared the clearing of psoriatic plaques that occurred after single or multiple exposures of UVC (254 nm), UVB (290-320 nm), UVA (320-400 nm), and a combination of UVA plus UVB in a ratio that was intended to simulate solar radiation. Using clinical and histologic criteria, a beneficial effect was observed only with the combination of UV-A + UV-B.To compare irradiation of different wavelengths, energy doses capable to inducing comparable erythema reactions must be used. The normal MED to UVB (MEDB) is 15 to 45 millijoules (mJ)/sq cm,1 while the MED to UVA (MEDA) is 1,000 times that of UV-B or 15 to

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