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March 1929


Arch Derm Syphilol. 1929;19(3):459-466. doi:10.1001/archderm.1929.02380210114010

We believe that at the present time most physicians in prescribing ultraviolet light determine the dosage by looking at a patient and estimating whether the skin is dark or light and asking him whether he is easily burned or tanned in the summer on exposure to the sun. With the diagnosis and the effect from the light which is desired in mind, we decide on the relative sensitiveness of the partbe treated and then from past knowledge of what a particular lamp will do we prescribe the definite number of inches that the lamp is to be placed from the patient and a definite number of minutes of radiation. We have used in ultraviolet light therapy no such factors as the Holz-Holzknecht unit, etc.,h factors have been used so much in prescribing x-ray therapy. The need for such a unit in ultraviolet therapy may not be as urgent as in

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