Multi-layer optical lens from Germany , multi-layer nano-optical coating, 5-speed magnification,makes it clear and acute in each multiple. A mong them, the eyepiece uses a 12.5x wide-angle eyepiece to provide a large field of view and 3D stereo imaging. The diopter is +6~-6. The height of the eye cup is adjustable, and the operator wearing the glasses can work comfortably out of the glasses.