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Year Invented - 1964
Inventor - Dr. Stanley Donald Stookey and Dr. William Armistead (scientists at Corning Glass works)
Function - Glass lenses that automatically darken (i.e., become sunglasses) in sunlight and clear (i.e., become regular glasses) in low light.
Details - Uses light-sensitive silver halide crystals. In bright sunlight, UV rays trigger these crystals, causing them to separate into silver and halogen atoms, which darken the lens. When indoors or in low-light conditions, the reaction reverses. This process happens automatically and can be repeated thousands of times without degrading the lens.
Visual representation of the lightening and darkening process of photochromic lenses.
Photo Credits: WeeTect
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