With a patient model head, two lenses, and a head mounted stereo display, the Eyesi Indirect simulator mimics all features of a real binocular indirect ophthalmoscope. When trainees put on the ophthalmoscope hat, they see a 3D simulation of a patient. To examine the patient’s retina, the lens must be positioned correctly in front of the patient model head. The corresponding visualization of the eye is dynamically rendered in real time.