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UVA/UVB sunglasses are designed to protect your eyes from harmful ultraviolet radiation, specifically UVA and UVB rays, which can contribute to cataracts, macular degeneration, and other long-term eye damage. The most effective protection comes from sunglasses labeled "100% UVA/UVB protection" or "UV400", which block all UV rays up to 400 nanometers—covering both UVA and UVB wavelengths.