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Ever heard of something called photochromic glass? It is a unique type of glass, capable to change its color when the sun hits. Put simply, when you put photochromic glasses on they will adjust from clear to dark and then back to clear as sunlight changes in your environment. This 블루컷 렌즈 capability makes photochromic glasses very practical for those who are frequently shifting from indoors to outdoors locations. New photochromic glass lenses have some miniscule molecules with the capacity for responding to particular kind of light called UV light. UV light is one portion of sunlight that is invisible to the eye, but has been found to substantially change the way in which these lenses behave. The molecules in the lens bend and absorb scatters some of that light when airborne, breaking it down and preventing us from seeing all of the colors visible to birds. Thus the lenses become darker, and you get a shade from the bright sunlight. In the absence of UV light, such as turning off and turning on and you are back inside, or when the sun has gone down, the molecules return to their natural shape, making the lenses clear. The process occurs within no time so that you can appreciate every moment with better vision.