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Many people use a pair of sunglasses for many years. In fact, sunglasses also have a shelf life, which is related to the wearing time, lens material, wearing habits, regional sunlight, and so on. Generally speaking, the best usage period for sunglasses is about two years, and it is best to replace them with a new pair after that.
Wearing sunglasses with proper UV protection is indeed an important measure to **reduce the risk** of developing cataracts, though it does not completely prevent them.
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