Polarized Lenses are used to reduce the glare (and they do so very efficiently), in particular light reflecting from flat non metallic surfaces such as the road, water, snow, etc. These filters resemble microscopic Venetian blinds that are oriented vertically thus breaking the horizontally polarized light wave patterns while allowing normal light through. Polarized lenses are usually designed by sandwiching the polarized filter between two optically correct lenses. Do yourself a favor and get yourself a great pair of polarized sunglasses today.