The U.S. Food and Drug Administration has approved the first contact lenses that can act like sunglasses.

WebMD.com says a special additive automatically darkens the lenses when exposed to bright light while they become clear again in normal or dark lighting conditions. It's the same technology used in photo-chromatic transition lens glasses.

The Acuvue Oasys Contact Lenses with Transitions Light Intelligent Technology are soft contact lenses for daily use for a maximum of 14 days by people who are near sighted or farsighted and have no eye disease. They can also be used by people with certain degrees of astigmatism, which is an abnormal curvature of the eye.