The edge khor safety eyeglasses feature interchangeable lenses that let you switch out one set for another, this frame comes with a single pair and additional lenses can be purchased separately for varying light conditions or replace damaged lenses. These safety glasses feature a wealth of protective features, such as the curved wrap-around frames and lenses that protect your eyes from the side and give you a comfortable fit. Tough polycarbonate lenses meet ANSI Z87.1 2003 safety standards, provide UVA, UVB and UVC protection and are coated with fog-resistant and scratch-resistant layers. The lens design is tapered to eliminate refraction, so the Edge Khor Safety Glasses won't compromise your vision or your safety.