Light is an electromagnetic wave, that means there is an electric field and a magnetic field oscillating perpendicularly to each other and to the direction of the light.

When ordinary light or unpolarized light is refracted by certain substances, such as oxygen and nitrogen molecules in the air, or reflected from non-metallic surfaces, such as water ice, paved roads, car windshields, it becomes plain polarized light; that means all the electric field oscillates in a unique direction creating "glare."

Polarization:

• Polarized lenses are created by matching, as a sandwich, two extremely thin lenses and inserting a tinted polarizing filter between them.

• The basic task of the filter is to transmit all the polarized light in one direction and to block the perpendicular one, which creates the "glare", on the entire spectrum of the visible light.