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  2. Photochromic lens - Wikipedia

    en.wikipedia.org/wiki/Photochromic_lens

    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. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken.

  3. Serengeti Eyewear - Wikipedia

    en.wikipedia.org/wiki/Serengeti_Eyewear

    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.

  4. Glasses are 50% off at GlassesUSA during Black Friday ... - AOL

    www.aol.com/lifestyle/glasses-usa-black-friday...

    Get a new pair of glasses as low as $26 at GlassesUSA during Black Friday week. Shop high-end brands like Ray-Ban or more affordable brands—they're all on sale.

  5. Photochromism - Wikipedia

    en.wikipedia.org/wiki/Photochromism

    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 ...

  6. 10 Most Expensive Sunglasses in the World and What They Cost

    www.aol.com/10-most-expensive-sunglasses-world...

    The good news is that if you are interested in buying a pair of expensive sunglasses, you needn’t travel far. Check out your local optical shop, or, if you know which brand you want, you can ...

  7. 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]

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