NoIR filters can help people minimize eye discomfort and maximize visual resolution. Filter shade number 50 ‚Äì yellow ‚Äì allows in 54% of visible light, has 100% ultraviolet protection and heightens contrast while maximizing brightness. It also offers blue blocker protection. It is often recommended for people who have glaucoma or pre-operative cataracts because of its glare control and general comfort. 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 6 1/4″ temple to temple.