This gives the wearer optimal coverage and protection yet remains small enough to fit in a coat pocket. Tinted or blocker type lenses are just colored plastic that limit the amount of color and light reaching the eye of the wearer. Polarizing is the only truly effective means to reduce glare. Glare is undesirable light which is reflected from horizontal surfaces such as frozen snow, ice, water and road surfaces.
Glare can cause eye fatigue due to stress and strain.
Optical Quality means undistorted views through the lens.