What are the sources of ultraviolet radiation, and is the extent of human exposure changing over time?
• What are the effects of sunlight on the skin? • What factors influence susceptibility to ultraviolet radiation? • Can ultraviolet-induced changes be prevented? If so, how? • Are sunlight-induced adverse skin alterations treatable and/or reversible? If so, how? • What are the directions for future research? In applying the recommendations of this consensus conference, it is important to recognize that special circumstances may exist for each patient. These may include unavoidable exposures to UVR or the inability to use certain of the preventive strategies. There are clearly some areas in which final recommendations cannot yet be made due to insufficient data. In these situations, physicians must use their best clinical judgment in advising patients. What Are the Sources of Ultraviolet Radiation, and Is the Extent of Human Exposure Changing Over Time? There are both natural and artificial sources of UVR. Although there are many artificial sources of this energy, sunlight is the only n
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