Twenty-seven years have elapsed since Finsen introduced ultraviolet ray therapy in the treatment of lupus vulgaris and other cutaneous affections. It would seem reasonable to believe that in view of the many experiments since that time in the application of these rays by numerous apparently qualified observers, there would be a reasonable unanimity of opinion as to the results obtained; yet this is not the case. In a critical review of the literature on the subject, it is astonishing to note the varying results achieved by different observers in the application of these rays in diseases of the skin.
The many physicians stating the merit or demerit of ultraviolet therapy may be conveniently classified in three groups: first, those who exaggerate its value by recommending it as a positive cure in numerous skin diseases. As an example, a physician, whose prolific writings on the subject have been mailed broadcast, says
BUTLER J. ULTRAVIOLET RAY THERAPY IN DERMATOLOGY. Arch Derm Syphilol. 1924;9(1):51–72. doi:10.1001/archderm.1924.02360190054004
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