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  2. Transitions Optical - Wikipedia

    en.wikipedia.org/wiki/Transitions_Optical

    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]

  3. Photochromic lens - Wikipedia

    en.wikipedia.org/wiki/Photochromic_lens

    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.

  4. Essilor - Wikipedia

    en.wikipedia.org/wiki/Essilor

    In 2010, it introduced Transitions XTRActive lenses, with technology that allows the lenses to activate behind the windshield. In April 2014, Essilor acquired the entire stake of PPG in Transitions. In 2018, Essilor announced that Transitions Optical had partnered with Johnson & Johnson Vision to make the light-adaptive photochromic technology ...

  5. Photochromism - Wikipedia

    en.wikipedia.org/wiki/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 ), where the two ...

  6. Eyebuydirect - Wikipedia

    en.wikipedia.org/wiki/Eyebuydirect

    Eyebuydirect is an online-only retailer and designs and custom-makes most of its glasses in-house. [13] [19] They carry primarily affordable eyeglasses, but also offer three premium brands. [13] [20] Ray-Ban, Oakley, ARNETTE and Vogue Eyewear are their outside premium brand offerings, while RFLKT is their in house premium brand. According to ...

  7. Sunglasses - Wikipedia

    en.wikipedia.org/wiki/Sunglasses

    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.

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