Ray-Ban Round Double-Bridge BR3647N Polarized Glass Sunglasses reduce glare and eyestrain in a way that exudes confidence and self-assurance. The addition of a full metal bridge span across the top brings a strongly cohesive presence to a time-honored Ray-Ban style. These great-looking round sunglasses feature polarized glass lenses affixed to a sturdy all-metal frame. Created in 1937, the classic lens was originally developed for military use. These lenses offer a high degree of clarity, comfort and protection, blocking out a majority of blue light and prevents 85% visible light from passing through the lens. Irresistible, contemporary styling with unisex appeal. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Polarized.