Light is emitted in waves by the sun, or by artificial sources likes a light bulb. These waves vibrate and travel in all directions from the source. When light encounters an object, it can reflect and enter the eyes. This light is focused onto the retina and sent to the brain where vision occurs.

Often, light reflects back to your eyes from flat surfaces such as roads or buildings, car hoods, sand and water. When this happens, the reflected light waves now travel in a single horizontal plane and with high intensity.

This « flattened » light is known as « polarized light ». When light bounces off a flat surface, it can become polarized and enter the eye causing blinding glare.