Contact lens that darken in UV light

Mark Wilson | Nov 12, 2009

The contact lens on the left contains photochromic dyes that darken in the presence of UV light. (Credit: Institute for Bioengineering and Nanotechnology)

Photochromic lenses that allow you to walk from inside to outside without putting on UV-filtering lenses have been around for decades. But the technology is just making its way to contacts.

Traditionally, these light-to-dark lenses have been constructed by coating a normal lens with a photochromic dye. When UV light hits the dye, the individual molecules expand, darkening the lens and absorbing light. Coating contacts, however, doesn't work so well.

So researchers at the Institute for Bioengineering and Nanotechnology in Singapore have laced contacts with a matrix on nano tunnels filled with these photochromic dyes. Not only has the team been successful in producing transition contacts; these contacts darken in the presence of UV light faster than standard lenses (just 10 to 20 seconds).

The researchers are now working on isolating the photochromic material to just the corneal region of your eye, granting you all of the UV filtering without turning your entire iris black.

But until they graft the timeless style of a Wayfarer onto my eyeball, I'll pass.

This story originally appeared on Gizmodo.

Via CNET Crave

Filed under: Future Tech
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