Optivisor® Binocular Headband Magnifier, 1/EAPRODUCT FEATURES: Can be worn over prescription or safety eyeglasses Optical Glass Prismatic Lenses Ground and polished to precision optical standards bevel edged and mounted in interchangeable plastic frame It Tilts Adjustable pivots allow the visor to be tilted out of the way when not needed and at your fingertips when you need magnification Adjustable Headband Conforms to fit all head sizes fabricated from a special blend lightweight material