A camera used for stereo fundus photography, that depends on introducing parallax (a lateral change in observation position designed to create a slightly different view perceived by each eye) between two pictures of the same subject. When viewed together, the brain combines these separately taken photographs into stereopsis (a pseudo-3D image or the viewer's ability to perceive a sense of depth). The stereo base is not constant, therefore the pupil must re-dilate between camera flashes.
