Oceanways Superview SL High Definition Mask.This mask has OMC (Optical Multicoating) technology that minimizes UV and glare. It reduces light nanometers for better eye comfort and changes white light harshness to bluish light for improved contrast. The TrueColor lenses are specially formulated to pick up red (lost at ten feet) and yellow (lost at twenty feet) and define objects and give better depth perception.