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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.

3. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Sunglasses of this type are sometimes called mirrorshades. A mirror coating does not get hot in sunlight and it prevents scattering of rays in the lens bulk. Sunglass lenses are made of either glass, plastic, or SR-91. Plastic lenses are typically made from acrylic, polycarbonate, CR-39 or polyurethane.

4. How to pick polarized sunglasses

   www.aol.com/news/top-rated-polarized-sunglasses...

   We spoke to experts for guidance on how to choose the best polarized sunglasses and used their criteria to pick great options from Sunski, Goodr, Knockaround and Roka.

5. Photochromism - Wikipedia

   en.wikipedia.org/wiki/Photochromism

   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 ...

6. Polarized and UV-protected sunglasses under $60

   www.aol.com/news/polarized-uv-protected...

   We spoke to two optometrists and the vice president of membership at The Vision Council to identify a handful of great polarized, UV-protected sunglasses for a reasonable price.

7. Costa Del Mar - Wikipedia

   en.wikipedia.org/wiki/Costa_Del_Mar

   Costa Del Mar's Caldera Sunglasses from the Untangled Collection. These are made from plastic pellets processed from recycled fishing nets. Costa Del Mar sunglasses. Costa Del Mar or simply Costa is an American manufacturer of polarized sunglasses based in Daytona Beach, Florida. [1] It is a wholly owned subsidiary of EssilorLuxottica.