IN HIS diagrammatic illustration plotting the localities affected by epithelioma of the face, Andrews1 placed an incidence of over 40 per cent in the region with which this paper deals. For a number of years one of us (E. F. C.) has been interested in the occurrence of these growths, together with keratoses and chronic scaly dermatitis, in the spot or band of light engendered by refraction of rays emerging from the lower edge of spectacle lenses of various sorts. Differing in degree according to the mounting and type of lens employed, there is a varying zone of light apparent on the cheek, often converging into an arc with the concavity up or appearing as a brightly luminous spot. This focal area remains rather definitely localized despite its changing relationship to the source of light. To obtain the sharpest focusing effect, this light must be directly above the patient's
CORSON EF, KNOLL GM, LUSCOMBE HA, DECKER HB. ROLE OF SPECTACLE LENSES IN PRODUCTION OF CUTANEOUS CHANGES, ESPECIALLY EPITHELIOMA. Arch Derm Syphilol. 1949;59(4):435–448. doi:10.1001/archderm.1949.01520290071007
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