Sunglasses are ordinary tinted glasses that we are usually familiar with for blocking the sun, ordinary sunglasses can only reduce the intensity of light, and can not effectively remove the bright surface of the reflection and glare in all directions, but in our daily life, in addition to sunlight and ultraviolet light, light through the uneven road, water and other places will produce irregular diffuse reflection of light, commonly known as ” glare”. The appearance of glare will make people’s eyes discomfort and fatigue and affect the clarity of vision, bringing a lot of trouble to people’s lives and out, especially drivers who drive, but also by its serious impact. Polarized lens can effectively filter out all kinds of glare and ultraviolet light up to 99%, not only can reduce light intensity, block glare to improve visual contrast, improve visual clarity. Previously, due to the manufacturing process, polarized lenses are only used for high-grade cameras and cameras for lenses, sunglasses rarely have polarized lenses.