Plane polarized light occurs when light is reflected off smooth, non-diffusing surfaces like water and snow. Polarizing filters absorb this plane polarized light, reducing glare. Modern polarizing filters are made by stretching polyvinyl alcohol sheets and dipping them in iodine, aligning the molecules. Polarizing lenses have benefits like reducing driving fatigue and enabling fishermen to see below water surfaces more clearly. They also don't bleach colors and reduce blinding from bright snow like regular sunglasses.