Treatment of psoriasis with long-wave ultraviolet light

1 November 1977

journal article
research article
Published by American Medical Association (AMA) in Archives of Dermatology

Vol. 113 (11) , 1525-1528
https://doi.org/10.1001/archderm.113.11.1525

Abstract

Repeated exposures of 4 by 5 cm sites to erythemogenic doses (20-300 J/cm2) of long-wave UV light (UV-A; 320-400 nm) led to improvement of the psoriasis vulgaris condition in 9 of 10 patients treated. Comparison studies showed the therapeutic responses to be similar to that of daily sunburn spectrum (UV-B; 290-320 nm) radiation. This finding suggests that the therapeutic response spectrum for psoriasis may parallel the action spectrum for delayed erythema of all portions of the UV spectrum that pass through psoriatic scale.