![]() Meanwhile, a good visible light source should create visible photons, and avoid wasting energy on harmful UV photons. Good eye-wear glasses block invisible and damaging UV photons present in sunlight, but shouldn't block visible photons. ![]() Unsurprisingly, this is an entirely intentional property. Lastly, I'll briefly address why this process happens in sunlight, but not indoors. This simple fact (plus a lot of auxiliary processes) was the basis of the main forms of photography all throughout the 19th and 20th century.īecause of this, the classic examples of photosensitive compounds are the silver halides ( $\ce$, making it dark. Silver salts have been isolated and manipulated for centuries, so it's surely been known they have a tendency to darken in light for a long time. ![]() Photochromic sunglasses are a smart new application of very old knowledge. My goal here is to provide some insight into the chemical/physical mechanisms at work. As mentioned in the comments, this topic can become exceedingly complex if all the aspects of current-gen photochromic lenses are brought to the table (and I'm sure a lot of it is locked away in trade secrets).
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