HealthDay News — The US Food and Drug Administration has approved the first contact lenses that automatically darken in bright light, the agency said Tuesday in a news release.

The technology, used for years in eyeglasses, stems from an additive that’s added to the lenses, which then react to the sun’s ultraviolet rays. The Acuvue Oasys lenses return to their normal tint when the user moves to normal or darker lighting.

In approving the auto-tint lenses, the FDA reviewed a clinical study involving 24 people, including daytime and nighttime driving performance. The study demonstrated no concerns with either driving or vision, the agency said.

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People with an eye infection, eye disease, severe dry eye, injury, or cornea abnormality shouldn’t use the product, the FDA said. Users shouldn’t sleep with the lenses, use the same pair for more than 14 days, or substitute the lenses for ultraviolet-protective eyewear, the agency added.

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The lenses are produced by Johnson & Johnson Vision Care, based in Jacksonville, Fla.

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