How do Photochromic lenses work?

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Photochromic lenses are designed to remain clear indoors and darken in response to UV light exposure outdoors. This transformation occurs due to photochromic molecules that undergo a chemical change when exposed to sunlight. The lenses provide convenience by adapting to changing light conditions, enhancing visual comfort. Resources like Transitions and Wikipedia offer detailed explanations of the technology and its applications. Understanding the science behind photochromic lenses can help users appreciate their functionality and benefits.
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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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