Sunglasses is not the deeper the color, the better
ultraviolet radiation to the human eye damage mainly depends on the wavelength of ultraviolet radiation, radiation time and strength and the strength of the human eye own protection mechanisms. Sunglasses can block ultraviolet light, because the lens and add a layer of special coating, but the color of the lens depth is only for visible light absorption performance, has nothing to do with uv resistance. Uv resistance depends on the lens material, rather than the color depth. In addition, under the strong light wear no uv protection sunglasses does more harm than don't wear glasses, can cause the disease, such as cataract seriously must choose when buying sunglasses quality assured products.
the color of the sun glasses with light gray, dark brown or light smoked for good. The second is green, amber, blue, etc. Red just as the sun or in the snow.