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The Impact of Visible Light on Skin.

Visible (VIS) light (400-700 nm), including blue light (400-500 nm), represents approximately 50% of the full optical solar spectrum. It is known since 1938 that visible light penetrates the skin. Biologic markers to fully interpret the significance of such penetration were not utilized at that time to determine the potential damage caused to the skin. The mechanisms of VIS light-induced pigmentation and melanogenesis are currently being investigated by the skin care industry.