Photochromic lenses darken automatically in sunlight and turn clear again indoors. A good choice if you want one pair of glasses for everything – clear glasses indoors, sunglasses outdoors.
The lenses have 100% UV protection.
Note:
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They don't darken inside a car, because the windscreen blocks UV rays.
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They don't get as dark as traditional sunglasses.
Photochromic lenses are also available together with a blue-light filter – you choose this when you order.