For summer, sunglasses are far more than just fashion accessories. A pair of high-quality sunglasses can avoid the damage of strong light and ultraviolet radiation and help protect the eyes. When buying sunglasses, one depends on the UV protection standards; second, the style and frame material of the glasses; third, the material and color of the lenses. According to these "three tricks", consumers can buy a pair of qualified sunglasses. High-end luxury brand sunglasses prefer nylon lenses.