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So what is this buzz word you keep hearing about? Photochromic means the sunglasses react to the light and the lenses will get darker the brighter it is outside. The sunglasses react to the UV light levels.
Photochromic sunglasses mean one set of lenses will be suitable in more conditions. If you cycle then your photochromic lenses can be used throughout the day, in low level light and also in bright light.