Mounted on a comfortable headband it can be flipped up when not in use. As both eyes are used this magnifier provides 3D vision enabling fine manual co-ordination. The lenses have built-in prisms that eliminates squinting and eyestrain. Can be worn over spectacles. Available with inter-pupillary distance adjustment, a feature offered only by highest quality Head Loupes. Side visors cut out extraneous glare, thus providing cool vision. This magnifier is best suited for any kind of detail work where both hands are required to be free to attend to the work.