Photo: Seeing the light: A new contact lens technology responds to UV light. The contact lens on the left (blue) contains photochromic dyes that darken the lens in the presence of UV light. The contact lens on the right (clear) contains no dyes. Credit: Institute for Bioengineering and Nanotechnology From Technology Review:
UV-responsive dyes embedded in contact lenses can quickly adapt.
Transition lenses--which darken automatically in response to bright sunlight--have been available for eyeglasses for 40 years. But adapting this flexibility to contact lenses has proven challenging. Now researchers in Singapore have developed UV-responsive, or photochromic, lenses that darken when exposed to ultraviolet light, protecting the eyes against the sun's damaging rays, and return to normal in UV's absence.
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