Patent ID: 9579018
Date: 2017-02-28
CPC Classifications: A61B,G02B

Claim:
1. An ocular fundus camera system comprising: light-source for illuminating, along an elongate, illumination path, the fundus in a subject's eye, an optical path having upstream and downstream ends and a long axis, extending downstream from the subject's eye, and carrying, downstream along its length, both light that acts as if the pupil were its source, and light reflected from, and carrying an image of, the fundus, an image-detecting sensor disposed for optical communication with light carried in said path, an aperture on the path's long axis, operatively associated with, and stationary with respect to, said sensor at a location which is upstream along the path from the sensor, positioned there to communicate to the sensor light carried in the path, a discriminatory, light-content shifting structure disposed centrally on said path's long axis upstream therealong relative to said aperture, operable selectively for producing, within that portion of the main path which is disposed intermediate the shifting structure and the aperture, relative trans-axial displacement-shifting solely of any non-collimated light carried in that portion of the path which is disposed upstream from the shifting structure, and a structure selectively placeable across said illumination path for introducing, effectively, into light reflected from the fundus, edge-portion-containing optical contrast imagery having at least one, contrast edge portion which lies at an angle relative to the direction of trans-axial shifting producible by said shifting structure, and whose spatial disposition in the fundus-reflection light is independent of eye movement.