Full diagnostic capability in a compact instrument make the Keeler Pocket Ophthalmoscope ideal for the practitioner on the move. Apertures and filters include wide angle, intermediate, red free, macula, slit, and red-free fixation. The Keeler Pocket Ophthalmoscope features a comprehensive viewing lens range from +20D to -20D for clear effortless examination of ocular structures. Plus powers: 1,2,3,4,6,10,15 & 20 diopters, and minus powers: 1,2,3,5,10,15 & 20 diopters. Supplied with case, spare 2.8v halogen bulb, and power handle with pocket clip.