Polarized lenses do not provide universal protection from glare, however. If the wearer tilts his head past 45 degrees or so, some of the horizontal light can enter and cause some bright spots. Some wearers who use polarized lenses in snowy areas may find that they lose some contrast between snow and shadows. Fishermen and drivers seem to derive the most benefit from polarized lenses because they deal with mostly horizontal surfaces. A fishermen wearing polarized sunglasses can see below the surface of the water to search for schools of fish or hidden obstacles. Drivers are no longer affected by a constant reflection of light from their hoods or the road ahead.

no actually horizontally polarised light is filtered by vertical polarisation filters. a polarisation filter does not filter light in the same plane of orientation as itself. analogy- vertical fence slats and rope, whipping the rope in the vertical plane through the slats, no resistance, whip in the rope horizontally and its stopped by the fence. think about it...