NoIR filters can help people minimize eye discomfort and maximize visual resolution. Filter shade number 22 ‚dark gray ‚ allows in 13% of visible light, has 100% ultraviolet protection and has an extremely comfortable color which cuts glare and sharpens focus with natural color rendition. It is often recommended for people with post-operative cataracts and for people with diabetic retinopathy. The standard fit-over style frame may be worn over most prescription frames or worn alone. It features side shields with temple lapped construction to keep out extraneous light and wind and it has curved temple pieces for a non-slip fit. Frame measures 5 1/2″ temple to temple.