OptiVISOR® is a precision binocular headband magnifier which permits unrestricted user efficiency while reducing eye strain - leaves both hands free and allows three dimensional vision - Used by anyone whose profession or craft requires close accurate work - Can be worn over prescription or safety eyeglasses. Made in the USA. Specifications... 2x Magnification 10" Focal Distance Optical Glass OptiVISOR® is equipped with these unique features: 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 of lightweight material - comfortable when worn for long periods of time. High Impact visor - Provides a tough, durable, always new appearance. Genuine Leather Comfort Band - Padded with orthopedic felt adds to comfort.