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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.
Transitions Optical is a U.S.-based company known for manufacturing photochromic lenses, which darken on exposure to specific types of light. The company was founded in 1990. [1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [2]
One of the most famous reversible photochromic applications is 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 so long-term outdoor applications are not appropriate at this time.
Transitions photochromic lenses. Blue-light blocking technology ... and contacts are only marked up 1% over cost — I've had members tell me that a comparable pair of glasses from another chain ...
Transitions – #1 selling brand of photochromic lenses. Formerly a joint venture between Essilor and PPG. Foster Grant – American brand selling non-prescription reading glasses; acquired from FGX in 2010. Bolon – Chinese ophthalmic frame brand. Molsion; Kodak Lens – Mid-range lens and coating brand, produced under license from Eastman ...
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]
Thermochromic and photochromic are classified as passive technologies. [ 2 ] When installed in the envelope of buildings, smart glass helps to create climate adaptive building shells , [ 3 ] which benefits include things such as natural light adjustment, visual comfort, UV and infrared blocking, reduced energy use, thermal comfort, resistance ...
Glasses can also be made of photochromic glass, whose tint changes according to radiation. Optical glasses are used for other, much more diverse and specialized applications, such as high-energy particle detectors (glasses detecting Cherenkov radiation , scintillation effects, etc.) and nuclear applications, such as on-board optics in systems ...
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