Founded in 2007, TrueVision out of Santa Barbara, California, has taken in about $20 million (most of it through debt financing). The startup has developed various platform for what it calls digital surgery, as opposed to optical surgery that employs traditional microscopes. It creates a type of “surgical cockpit” that allows a surgeon to experience the operation in 3D, with AR-powered overlays that might include templates to align surgical instruments or for pre-operative planning.