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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.
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 ...
Cubitts, established in 2012, is an eyeglass manufacturer based in Kings Cross, London, England.The company creates handcrafted frames, and sunglasses, constructed with custom pins that secure the acetate based on a rivet designed by Lewis Cubitt, one of the three Cubitt brothers who inspired the brand name.
Sometimes, and particularly in the dye industry, the term irreversible photochromic is used to describe materials that undergo a permanent color change upon exposure to ultraviolet or visible light radiation. Because by definition photochromics are reversible, there is technically no such thing as an "irreversible photochromic"—this is loose ...
[40] [41] The second, about "Filters for direct observation of the sun", was published in 2015 [42] [43] and the third "Sunglasses for running, cycling and similar active lifestyles" in 2022. [44] [45] As of 2009, the European CE mark indicates that the glasses actually offer a certain level of sun protection.
Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. [1] Photosensitive glass was first discovered by S. Donald Stookey in 1937. [2] [3] [4]