All sunglasses are designed to reduce brightness, but glare from the sun can still cause eye strain, squinting or even temporary blindness – which can be particularly hazardous while driving a vehicle. To avoid this, Optical Masters recommends polarized lenses, which provide 100% protection from glare and block 100% of harmful UV rays.

Visible light waves from the sun travel in all directions. When sunlight reflects off a horizontal surface, like a road or water, it often becomes concentrated horizontally. This is known as glare.

Vertical light is useful to the human eye, but glare masks useful light, making it difficult and uncomfortable to see. Polarized lenses block glare and allow only useful vertical light to enter the eye and are especially useful for activities such as driving, skiing and fishing.