Welch Allyn Binocular Indirect Ophthalmoscope (BIO) 12500. Not had much use. JUST BEEN SERVICED. Battery works great. I charged for a short time from a low charge state waited two weeks and the charge remained Very bright light (variable rheostat). PD adjustment. Screw type adjustment over vertex of calvarían and occipital protuberance to achieve snug fit. Angle of unit can be adjusted and lever to change illumination stop (aperture) and light colour (green/RF, blue, white) and vertical position of light. Never forget, you have the option for pupil testing (highly collimated beam can be used on mid sagittal plane from just under 1m) or gross assessment of fluorescein stain in patients unable to use a slit lamp. A 20D Volk lens used a a simple loupe is ideal, to this end.
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