It is because that yellow sunglasses are able to absorb one hundred percent of ultraviolet ray and blue light in sunlight. After the blue light is absorbed, the objects within the vision will be clearer and brighter. Many athletes engaged on outdoor sports, such as hunting, bicycle and shooting prefer sunglasses with yellow lenses. Additionally, different colored sunglasses have different fields. Tawny is acknowledged as the best color for sunglasses. It can absorb almost one hundred percent of both ultraviolet ray and infrared ray. It makes people feel comfortable and keeps tired away. Grey is also a popular color for sunglasses. It will absorb all the infrared ray and part of ultraviolet ray. It changes color of objects and makes them look natural and mild. Green lenses, the same with grey ones, could absorb hundred percent of ultraviolet and ninety-nine percent of infrared ray. Also, it obstructs green light and red light to come into eyes. It makes objects look fresh. Many fashion ladies have red sunglasses. Red lenses are good at absorbing light with shorter wavelength. There capacity of protection is lower than the other colors. It shall be emphasized that blue sunglasses will pick up harmful blue lights and let them enter people’s eyes. It is totally not healthy.