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Katie


04/16/2012

what molecules are the photochromic glasses lenses coated with?

I just wonder what molecules are the photochromic glasses lenses coated with? How do they cause the lens go from dark to clear?
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  • Jerry

    07/23/2012

    As we know that photochromic lenses can turn dark in sunshine and fade away in door. That because the lenses contain organic (carbon-based) molecules that can react to light in a slightly different way. The molecules in the lenses can change their color and size when ultraviolet light strikes them. Though each molecule changes by only a fraction of a nanometre,there are many molecules in the lenses that can react in the same way, thus make the lenses turn dark and fade away quickly.
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