Sunglasses should be replaced at least every two years, scientists warned today.
Rays from the sun damage lenses over time - meaning they gradually let more UV light through and provide less protection.
Without adequate UV filters, the eye is exposed - and the damage can cause long-term, irreversible harm to vision.
Rays from the sun damage lenses over time - meaning they gradually let more UV light through and provide less protection.
Without adequate UV filters, the eye is exposed - and the damage can cause long-term, irreversible harm to vision.
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