The Donegan OptiSIGHT is a binocular headband magnifier with prismatic lenses molded from precision optical grade acrylic. The visor provides hands free magnification for detailed work. The magnifier will adjust for different work positions and will also pivot out of the way for normal vision. This visor can be used in conjunction with prescription glasses. The prismatic lenses are designed to eliminate fatigue and eye strain that is common with other magnifiers. The OptiSight includes a 3x, 4x & 5x lens plate. Swapping out lens plates is simple, and does not require tools. The visor assembly is constructed of durable impact resistant plastic. Features Black Polymer Visor and Headband Acrylic Prismatic Lenses3x, 4x & 5x MagnificationsWill Work with Prescription glasses