The Optivisor is a precision-made binocular magnifier that is worn on the head leaving both hands free. Can be instantly tilted downward when needed and upward when not in use. Can be worn over regular prescription of safety glassed. Comes with dial adjustable, conforming headband. ABS high impact comfort band, optical glass lenses mounted in an interchangeable frame. Six lens powers available, plus and attachable auxiliary OptiLoupe lens for additional magnification. ? See what your working on with the Optivisor! These precision-made binocular magnifiers are worn on the head, leaving your hands free. Ideal for model railroad work, the optivisor can be instantly tilted downward when needed and upward when not in use. Can be worn over regular prescription or safety glasses.