New Opti Visor Optical Glass Magnifier This is a new Opti Visor headset 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 1.5X magnification It has a focal length of 20" (50.8 mm)