NoIR filters can help people minimize eye discomfort and maximize visual resolution. Filter shade number 22 - gray - allows in 11% 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 Contemporary wrap around frame (#35) is designed to wrap closely around the face for close protection and light blocking. This Contemporary frame style cannot be worn over other glasses.