The Welch Allyn Coaxial Ophthalmoscope represents the current model used on the USMLE; featuring 6 apertures (programs of light) and 28 focusing lenses, the visual system helps eliminate shadows. The Welch Allyn MacroView Otoscope supports a bigger, better 2X larger field of view of the tympanic membrane with the widest focal range of any otoscope; built-in throat illuminator.