Donegan OptiVisor with Lens LX-3, 1 3/4 x 14 Headband binocular visor with snap-in 1.75X magnifying lens for hands-free viewing Optical-grade acrylic prismatic lens for improved focus and reduced eye strain Visor size-adjustment knob for customized fit Visor tilts out of way when not needed 14" focal length for a variety of uses