Sunglasses with Photochromic or Transition lenses ...
Sunglasses with Photochromic or Transition lenses. These Sunglasses feature Photochromic lenses that darken on exposure to UV radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state. Typically, photochromic lenses darken substantially in response to UV light in less than one ...
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