Monday, November 23, 2009

Transition Contact Lenses

Transition sunglasses have been around for a long time, but scientists had been unable to miniaturize the technique. That is until now. The new technique actually makes contact lenses more effective than the sunglasses are.

Picture embedded below.

"Transition lenses, glasses that darken in bright light, have been around for decades. They consist of lenses coated in photochromic dyes that change shape when irradiated by sunlight. When the dye changes, they block out the sun, darkening the lens.

Unfortunately, the small size and malleable material of contact lenses make them impossible to coat uniformly. Therein lies the breakthrough. Rather than coating the lenses in dye, the IBN team embedded the dye within the contact lenses. The resultant lenses not only darken in the light, protecting the wearer from UV rays, but do so orders of magnitude faster than regular transition glasses.

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