Patent US 5,315,329

A stereo eye fundus camera capable of simultaneously recording a stereo pair of images of the fundus of an eye of a patient onto color photographic film for processing into a 3-D color photograph includes a light source for illuminating the patient's eye fundus and stereo optics for projecting a stereo pair of images of the eye fundus onto the film. Provisions are made in the camera for recording an image of a standardized gray color scale on the film using light from the light source, for generating a reference target light beam of a predetermined size and shape and parfocal with the optical means and projecting it onto the eye fundus within the field of view while the eye fundus images are formed, whereby the reference target is recorded on the film with the eye fundus image, and for selectively generating right and left eye fixation light beams and projecting a selected one of them onto the corresponding eye of the patient at a predetermined position outside of the field of view of the photographic optics, whereby when the patient fixes on the projected fixation beam, the patient's optical nerve is at a predetermined position in the field of view.