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Eye Glasses That Can be Manually Switched to 'Sunglass Mode' May be on Their Way

from Gizmag

Glasses with transitional lenses are a neat idea in theory, but they have some shortcomings in practice. That's why researchers from the Georgia Institute of Technology are developing an alternative – clear eyeglasses that can be manually tinted into sunglasses, by the user. The lenses contain electrochromic polymers, which respond to electrical current instead of ultraviolet light. In the prototype glasses, a mix of cyan, yellow, orange and blue polymers was used to create a brown tint, that blocks up to 70 percent of incoming light within a few seconds. By changing the ratios of the polymer colors, however, other colors of tints could also be achieved. more

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