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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.
Photochromism. A photochromic eyeglass lens, after exposure to sunlight while part of the lens remained covered by paper. Photochromism is the reversible change of color upon exposure to light. It is a transformation of a chemical species ( photoswitch) between two forms by the absorption of electromagnetic radiation ( photoisomerization ...
Bollé Brands. Number of employees. 52. Website. www .serengeti-eyewear .com /us /. Serengeti Eyewear is a sunglasses line owned by Bollé Brands. Their main focus is eye protection; the company researches and develops technology such as photochromic lenses, polarized lenses, spectral control, among others.
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In 2018, Essilor announced that Transitions Optical had partnered with Johnson & Johnson Vision to make the light-adaptive photochromic technology available in a contact lens for the first time. Later that year, Time magazine named Acuvue Oasys with Transitions Light Intelligent technology the best invention of 2018. [58]
A spiropyran is a type of organic chemical compound, known for photochromic properties that provide this molecule with the ability of being used in medical and technological areas. Spiropyrans were discovered in the early twentieth century. [ 1] However, it was in the middle twenties when Fisher and Hirshbergin observed their photochromic ...
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