UV-blocking sunglasses are designed to protect your eyes from harmful ultraviolet (UV) rays emitted by the sun. These sunglasses filter out UV radiation, which can cause eye damage, including cataracts and macular degeneration. Wearing them helps reduce glare and improves visual comfort in bright conditions. Most UV-blocking sunglasses come with labels indicating their level of UV protection, typically blocking 99% to 100% of UVA and UVB rays. It's important to choose sunglasses that fit well and provide adequate coverage to ensure maximum protection. Regular use of these sunglasses can contribute to long-term eye health.