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 Molecules in all plastic photochromic lenses lose their darkening and lightening ability due to UV exposure. Corning's 30+ years of photochromic innovation has culminated in SunSensors in-mass technology, in which the photochromic molecules are distributed evenly throughout the lens material. As UV degrades some molecules, others replace them, providing a longer lasting, more consistent color over the life of the prescription.
How Photochromic Eyeglass Lenses Work
The result of years of research and development, today's photochromic lenses are the product of highly sophisticated technologies.
In its most basic form, a photochromic lens changes color because of a chemical reaction. When someone wears photochromic lenses outside, exposure to UV causes the lenses to darken. Indoors, at night, or on cloudy days there isn't as much UV to cause the chemical reaction. Therefore, the lenses remain relatively clear.
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