New. Opti Visor Optical Glass Magnifier. This is a new. Opti Visor magnifier. This is a precision instrument that improves vision and will increase your efficiency. It leaves both hands free. Each lens is polished to precision opthalmic standards. The frame is made of lightweight durable impact resistant materials. It can be worn over prescription or safety glasses. The comfortable continuous headband is fully adjustable to fit any size. It has adjustable pivot knobs holding the visor in any position for easy flip-up viewing. There are interchangeable lens plates. It is great for jewelers, hobbies, sewing, artists, draftsmen, architects, pharmacies, doctors and more. It has 2.75X magnification. It has a focal length of 6" (152 cm).