With Polycarbonate (PC) UV400 lenses which is commonly known as PC bulletproof glass qualitative light not easy broken can prevent harmful uv rays of more than 95%. Comfortable to wear. The split (OPOLLY Sports) Sports glasses test standard: standard China - QB2457-1999 the European and American standard -- EN1836 CE89/686 and 686. Blue lens: blue lens can filter out a lot of blue light which can improve visual contrast and clarity under the condition of air pollution is serious or foggy wear effect is better. Dazzle colour lens: the lens surface mirror coating with high density such lenses absorb more reflection of visible light suitable for outdoor sports. Yellow lenses: strictly speaking yellow lenses do not belong to the sun glasses because it almost does not reduce the visible light but in the foggy and at dusk the yellow lenses can improve contrast provide more accurate video so also known as night vision there are some people like to wear the yellow lenses used as decoration.Dark brown lens: dark brown lens is actually a bit of a pale yellow lighter because it is over so called the lens. It's light brown. Can be used as goggles or rain mirror.