POLARIZED LENSES FOR GLARE REDUCTION: Offering eye comfort, vision clarity and allowing you to take in the view without squinting by blocking the sunlight reflections that cause glare. Glare results from sunlight reflecting off smooth surfaces, water, snow or flat roads which can be dangerous and annoying. It can cause sun blinding and other eye issues for light-sensitive people. Polarized sunglasses will shield your eyes from glare with full UV400 protection.