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Comparison Between Visual Grading and Reflectance Measurements of Erythema Produced by Sunlight11From the Division of Dermatology, University of Oregon Medical School, Portland, Oregon.

1958; Elsevier BV; Volume: 30; Issue: 6 Linguagem: Inglês

10.1038/jid.1958.58

1523-1747

Farrington Daniels, John D Imbrie,

Skin Protection and Aging

The scientific study of the skin and its responses requires consideration of methodology of observation of skin color.The quantitative determination and expression of skin color is of dermatological interest for a variety of reasons.Such measurements can be used (a) to quantify the erythema and pigmentation following exposure to ultraviolet light and ionizing radiation; (b) for matching of skin grafts, cosmetics and prostheses to background skin color expressed in standard terms such as those used in the paint industry; (c) for quantitative confirmation or refutation of clinical impressions of correlations between skin color and tendencies to various disease processes such as actinic keratoses, skin carcinomas, and malignant melanomas.The human eye and its associated central nervous system circuitry is the principal diagnostic tool of the dermatologist.Its remarkable capacities and deficiences are of concern in dermatologic diagnosis.The eye and its circuitry have high resolving power.The central nervous system contributes to the visual apparatus modifications and corrections which permit vision to surpass the optical qualities of the eye itself.As a device for discriminating color, the eye is said to be able to discriminate at least 10 miffion different colors, shades and hues (1).Difficulties in research or in the clinic do not arise from deficiencies of sensitivity or discriminatory capacities of the visual apparatus, but from other causes.The physics, psychophysics and psychology of color have been reviewed extensively by Judd (1, 2).Among the factors which can produce error in color identification and description are the spectral color of the viewing light, color of the surrounding objects and background, and colors previously seen.The effects of light, background