Photochromic Replacement Lenses
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Photocromic lenses AKA Changing colour. Photocromic lenses are especial lenses that change their colour depending on the ammount of UV Rays that reach to their surfaces.
They activate when the sun is reaching the lenses, and de-activate when there is no sun on the surface of the lens.
Sunglasses Restorer is the replacement lenses company.