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Men's Photochromic Polarized Sunglasses for Driving, Rectangular Frame with 100% UV Protection (Black(sports)/Discolor)(Size:M) : Amazon.co.uk: Fashion
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All About Eyes Abuja - Lenses that go dark in the sun are referred to as #photochromic lenses. They have tiny molecules embedded in them that react with UV (ultraviolet) sun rays
![How can my glasses change from transparent, when I'm inside, to dark when I go outdoors? | HowStuffWorks How can my glasses change from transparent, when I'm inside, to dark when I go outdoors? | HowStuffWorks](https://cdn.hswstatic.com/gif/How-to-activate-transition-lenses-without-sun.jpg)