Photochromic lenses were created in the 1960s at the Corning Glass Works Inc., and became the first variable tint/photochromic lenses brought to the marketplace. They typically take around 30 seconds to fully darken and between two to five minutes to return to a clear state. They are typically used as sunglasses that conveniently switch from a clear lens indoors to a sunglasses depth tint when outdoors, and vice versa. Often referred to as transitions or reactolights, p hotochromic lenses are made of many lens materials including plastic, glass or polycarbonate. Photochromic lenses darken to a sunglasses tint when exposed to sunlight, or UV ultraviolet, and return to a clear state when indoors, away from UV light.
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