The first contact lenses containing an additive that automatically darkens when exposed to bright light have been cleared by the US Food and Drug Administration (FDA), Medscape.com reports.
The soft contact lenses, called Acuvue Oasys, are approved for daily use to correct myopia or hyperopia, and for certain degrees of astigmatism.
"This contact lens is the first of its kind to incorporate the same technology that is used in eyeglasses that automatically darken in the sun," Malvina Eydelman, director, Division of Ophthalmic, and Ear, Nose and Throat Devices at the FDA's Center for Devices and Radiological Health, said in a news release.
The lenses contain a photochromic additive that causes the lenses to darken slightly in bright sunlight. The degree of darkening is based on the amount of ultraviolet light. The lenses return to their regular tint in normal or dark lighting.
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