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You can also get deals on photochromic lenses.
Photochromic lenses simply get light indoors and dark outdoors.
The Zebra photochromic lens changes brightness depending on the intensity of the sun.
The Zebra photochromic lens is specially recommended for mountain biking, trail biking and climbing.
Photochromic lenses are another great option because they leave your hands and your pockets free!