Polarised lenses are used in Sunglasses to reduce glare from various surfaces such as snow, water, metal and computer screens. The process of polarization is similar to how a venetian blinds controls sunlight through a window. Polarized lenses have a laminated surface containing vertical stripes which only allow vertically polarized light to enter the wearer's eyes. Glare is therefore eliminated because the horizontally polarized lightwaves cannot bypass the polarized filter.
Because of how well polarized lenses cut out glare they are ideal for use when driving, fishing, skiing or boating.