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2. Photochromism - Wikipedia

   en.wikipedia.org/wiki/Photochromism

   One of the most famous reversible photochromic applications is color changing lenses for sunglasses.The largest limitation in using photochromic technology is that the materials cannot be made stable enough to withstand thousands of hours of outdoor exposure so long-term outdoor applications are not appropriate at this time.

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. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Sunglasses can improve visual comfort and visual clarity by protecting the eye from glare. [24] The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces, such as water. They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface ...

5. Polarized and UV-protected sunglasses under $60

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

   L.L.Bean Classic Aviator Polarized Sunglasses. These aviator-style sunglasses from L.L.Bean are polarized and they’re 100% UV A, B and C-protected. (While UVA wavelengths are the longest and ...

6. As Seen on TV review: HD Vision sunglasses - AOL

   www.aol.com/news/2010-07-22-hd-vision-sunglasses...

   The Product: HD Vision Sunglasses The Price: HD Vision Ultra, online $10 plus $6.99 shipping and handling: $9.99 in some retail stores: HD Vision WrapAround, online $14.99 plus $7.95 shipping and ...

7. 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.