Here, in our eyebuddy glossary, you will find what you need to know about eye-care and eye-wear.
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|Photochromic lenses react to bright light by going darker, then fade back to almost clear in darker conditions. In fact they react to the UV (ultraviolet) radiation contained within sunlight and for that reason do not go dark when UV is not present such as at night, indoors, or in a car (as the windscreen has a UV filter to protect the upholstery from fading).
Rather than a replacement for sunglasses photochromic lenses should be considered as a clear lens replacement. They can do everything a clear lens can do plus they give 100% UV protection even when they are clear and of course they will go dark in bright sunlight. However many people will find they also need sunglasses, especially for driving and in the brightest conditions abroad.