NEITZ Binocular Loupes BL Series with the most durable NEO Frame have the best balance of magnification, visual field diameter, resolution, and aberration to achieve a compact and lightweight product. The visual field is bright, 3D image can be obtained easily, and focus can be adjusted to match working distance required for the users. One loupe fits all doctors with wide range of working distance (350-550mm/13.78-21.65inches).