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A binocular indirect ophthalmoscope (BIO) is worn as a headset and is used in conjunction with a condensing aspheric lens held close to the patient’s eye. A BIO provides a much wider field of view (45°) than a direct ophthalmoscope and permits viewing of almost all the patient’s retina. The BIO is the viewing instrument of choice for retinal examinations. The view provided by the BIO is stereoscopic (3D), inverted, and illuminated with magnification of about 5X. Some BIOs have a built in video camera to permit eye care professionals in-training to view the examination on a screen