Depth perception is the result of our brain processing two slightly different images, one image from each of our eyes. Similarly, a 3D endoscope has two image sensors which capture different views. One view must be delivered only to your left eye, and the other to only your right eye. The 3D display achieves the separation of the left and right eye images by polarizing the light for each image oppositely. The viewer wears polarized 3D glasses to allow each eye to only see the left or right view captured by the endoscope.