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Author Topic: Glasses that turn dark  (Read 6128 times)


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Glasses that turn dark
« Reply #1 on: July 15, 2011, 09:32:32 AM »
Q: What is the name for glasses that react to sunlight and get darker?
A: Corning makes lenses known as photogrey and photosun. They are made of glass. The more recent lens is called the transitions lens. It is made of plastic. It comes in grey or brown.  They react to the ultraviolet component of light. On a practical level this means they darken when outdoors but not in a car, where the car windows filter out the UV.