This is a classic medical device for ophthalmology. This ophthalmoscope features excellent luminosity with the Xenon Halogen technology. It also adopts a professional lens system, which makes doctors conveniently get a clear visual field for examining the interior structures of eyes, such as dioptricmedia. It is easy to use and comprehensive, with 5 different diaphragms and offering all standard functions such as the fixation star and green filter. Other features include: – 20 D to + 20 D correction range, and an end clamp with built-in switch. It comes with two LR6 AA batteries in case. 5 diaphragms available: large spot, small spot, fixation star, half-moon, green filter.