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2. 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.

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 - Wikipedia

   en.wikipedia.org/wiki/Glasses

   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 ...

5. I tried those Pair Eyewear glasses with the magnetic ... - AOL

   www.aol.com/lifestyle/tried-those-pair-eyewear...

   While other glasses-by-mail companies compete largely on price, Pair is all about flair: You can instantly change the look of your glasses by snapping on a magnetic "top." ... The top 10 best ...

6. Photochromism - Wikipedia

   en.wikipedia.org/wiki/Photochromism

   Photochromic coordination complexes are relatively rare in comparison to the organic compounds listed above. There are two major classes of photochromic coordination compounds. Those based on sodium nitroprusside and the ruthenium sulfoxide compounds. The ruthenium sulfoxide complexes were created and developed by Rack and coworkers.

7. Essilor - Wikipedia

   en.wikipedia.org/wiki/Essilor

   After many years as rivals, Essel and Silor merged on 1 January 1972 to form Essilor, then the world's third-largest ophthalmic optical firm. [1] Its first year of existence was marked by the creation of Valoptec, a non-trading company composed of stockholder managers who held half the company's capital stock, and the purchase of Benoist-Bethiot, a French lens manufacturer specializing in ...