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A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.
Some manufacturers produce special photochromic lenses that adapt to the varying light conditions when driving. Lenses of fixed tint are graded according to the optical density of the tint; in the UK sunglasses must be labelled and show the filter category number.
A photochromic eyeglass lens, after exposure to sunlight while part of the lens remained covered by paper. Reversible photochromism is the basis of color changing lenses for sunglasses . The largest limitation in using photochromic technology is that the materials cannot be made stable enough to withstand thousands of hours of outdoor exposure ...
Oakley. Saint Laurent. Stella McCartney. ... HD progressive and polarized lenses. Transitions photochromic lenses. ... "Optical employee here … frames, lenses, and contacts are only marked up 1% ...
Oakley, Inc. is an American company headquartered in Foothill Ranch, California, which is an autonomous subsidiary of Luxottica. The company designs, develops and manufactures sports performance equipment and lifestyle pieces including sunglasses , safety glasses, eyeglasses , sports visors, ski/snowboard goggles , watches, apparel, backpacks ...
Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in the lenses; however ...