Thalita Luna
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Photochromic lenses are common in glasses, they stay transparent indoor, but get darken when exposed to sunlight. How does it work ?
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Welcome to PF. 
Google is your friend; following links are from searches on photochromic lens and photochromic molecule:
https://www.transitions.com/en-us/why-transitions/the-technology/photochromic-tech/
https://en.wikipedia.org/wiki/Photochromism
Google is your friend; following links are from searches on photochromic lens and photochromic molecule:
https://www.transitions.com/en-us/why-transitions/the-technology/photochromic-tech/
https://en.wikipedia.org/wiki/Photochromism
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