NoIR filters can help people minimize eye discomfort and maximize visual resolution. Filter shade number 23 - dark gray - is an extra dark filter which allows in only 4% of visible light, has 100% ultraviolet protection and provides a comfortable color which cuts glare, sharpens focus and provides a natural color rendition. It is often recommended for people with Retinitis Pigmentosa for its light sensitivity, glare control and contrast enhancement. The Contemporary wrap around style frame offers very sleek and contemporary styling and wraps closely around the face for close protection and light blocking. It cannot be worn over other glasses. This Contemporary wrap around frame 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.