An endoscope has a first end for insertion into a body, or other visually obscured area, with an optical image-forming lens device in the first end for forming two, side-by-side images of an object on opposite sides of the central axis of the endoscope. The images are transmitted to the opposite end...http://www.google.com/patents/US5459605?utm_source=gb-gplus-sharePatent US5459605 - 3-D endoscope apparatus
