NoIR filters can help people minimize eye discomfort and maximize visual resolution. Filter shade number 58 ‚ light yellow ‚ allows in 65% of visible light, has 100% ultraviolet protection, and heightens contrast while offering the maximum brightness to enhance visual acuity. 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.