NoIR filters can help people minimize eye discomfort and maximize visual resolution. Filter shade number 20 - gray - allows in 63% of visible light, has 100% ultraviolet protection. As such, it heightens contrast for indoor use. This soothing color sharpens focus and provides excellent glare protection. This Retro wrap around frame measures 130mm x 140mm x 44mm is designed to wrap closely around the face for close protection and light blocking.
This frame style cannot be worn over other glasses. Above image is for style only and does not perfectly represent actual lens color.