Meets both ANSI Z87.1 and CSA Z94.3 standards. Features a high contour single piece lens with 180A distortion free viewing and excellent optical quality. Upper brow guard offers protection from overhead particulate hazards. Patented non-pressure co-molded temples and anti-slip silicone nose pads provide excellent fit and comfort. The contrast lens is an excellent alternative to a standard clear lens. Reduces eye fatigue and eye strain caused by glare and blue light, while preserving color recognition, depth perception and contrast. The contrast lens is perfect for work environments that involve neon lights, computer screens and other forms of light irritation.