Provides hands-free magnification for more accurate and efficient viewing. The visor tilts up for normal viewing, or down for magnification. Brings work closer into focus, reducing eye strain and fatigue. Special features: precision optical grade acrylic prismatic 3X, 4X, and 5X lenses, can be worn over prescription or safety glasses, visor shields out unwanted glare, high strength plastic. 7X power lens sold separately.