Take on a gamut of changing conditions and activities with just one pair of versatile eyewear Wiley X ANSI approved frames can accommodate prescription safety lenses up to +6.00/-6.00 Total Power Meets and exceeds ANSI Z87.1-2003 high velocity impact safety and optical standards Includes 2 sets of lenses- Smoke Gray and Clear Smoke Gray lenses provide maximum glare reduction, won't distort colors and are excellent in bright/glare conditions Clear lenses offer maximum light transmission, see precise color values, great for hazy or overcast, dusk/dawn conditions