So, why are polarized lenses so awesome? Polarized lenses are coated with a special chemical film that helps reduce glare. Glare is caused when light from the sun is reflected off of water or a solid surface. By neutralizing glare, polarized lenses help you see objects more clearly, and also help reduce the harmful effects of UV light.
The sun’s rays reflect light in every direction, so when a ray hits a flat surface, the reflected light shines back at your eye and is magnified, causing glare. It reduces your depth perception, distorts your view and color perception, and can even temporarily blind you.
Regular sunglasses are designed to only reduce the amount of light that is transmitted through the lens horizontally and vertically. But the chemical filter on the lenses of polarized sunglasses is designed to absorb horizontal light waves, while still allowing vertical waves to pass through. Because light only travels in one direction through polarized lenses, glare is eliminated.