All About Eyes Abuja - Lenses that go dark in the sun are referred to as #photochromic lenses. They have tiny molecules embedded in them that react with UV (ultraviolet) sun rays
Self-Darkening-Eyeglasses
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The World's First Variable Polarized Photochromic Lens – FirstView Eye Care Associates – Plattsburgh NY 12901
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Glasses Direct ™ - Transitions® Light Intelligent Lenses™
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The Eye Surgery & Laser Centre - Yes. Photochromic lenses turn dark and offer protection from the sun on exposure but when in most modern cars, the windscreens have UV protection properties