Slip on shades as stylish as the Ray-Ban RB4371 Sunglasses and youll always stay cool. Polarization eliminates glare, increases visual clarity, enhances contrast and reduces eye strain. The classic B-15 lens was originally developed for military use way back in 1937. It offers exceptional clarity, comfort and protection, blocking out a majority of blue light, while preventing 85% of visible light from passing through the lens. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Non Polarized.