Amazon.com: Ray-Ban RB3647N Round Shape Non-Polarized 。Round Double Bridge Sunglasses - Rb3647n combine a refined copper metal frame with light brown gradient polarized lenses that reduce glare, help preserve color fidelity, and shield eyes from the suns harmful rays for clearer, more comfortable vision in bright conditions. By cutting harsh reflections and keeping colors true, the premium lenses can help vision feel less tiring over long days outdoors.Balanced proportions51.1 mm lens width, a 22 mm bridge, and 145 mm templessupport an even, secure fit with comfortable weight distribution, while the double-bridge construction adds stability and a classic round silhouette that flatters everyday looks. They can also be fitted with prescription lenses for a more precise, personal fit without sacrificing the clean, iconic shape.