How Do Photochromic Glasses Work and Why Do Photochromic Lenses Turn Darker In the Winter Than In Summer?

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How Do Photochromic Glasses Work and Why Do Photochromic Lenses Turn Darker In the Winter Than In Summer?

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We have two types of explanation here: one physical, one chemical. It is likely that chemistry is responsible for the greater effect. The sun would be fairly low in the winter sky, its rays shining almost directly on, and perpendicular to, the vertical plane of the lenses. In the tropics, the sun could be almost directly overhea

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