The perfect visual aid for crafts, workshop, home and office. Easy to use and loaded with features! Can be worn over prescription or safety glasses Brings work closer into focus, reducing eye strain or fatigue 3 precision optical grade acrylic lenses to change magnification Visor tilts up for normal viewing, down for magnification. Visor is made of lightweight, durable impact-resistant materials. Magnifies 13/4" x at 14" Not a safety device. Do not use in place of safety glasses or face shield.