We have designed a recording ophthalmoscope which requires substantially less light than conventional ophthalmoscopes or fundus cameras. A laser beam of <100-μW total power provides the flying spot on the subject’s retina, allowing an inversion of the usual division of the pupil: only the central half-millimeter is needed for illumination, and the remaining 50 mm2 are used for light collection. No optical image of the retina is formed, but a photomultiplier tube in a pupillary conjugate plane provides video signals to a TV monitor, where an image appears. A simple analysis explains the gain in sensitivity. Various manipulations of the image are described, some of which are uniquely possible with this system.
© 1980 Optical Society of America
Original Manuscript: March 11, 1980
Published: September 1, 1980
R. H. Webb, G. W. Hughes, and O. Pomerantzeff, "Flying spot TV ophthalmoscope," Appl. Opt. 19, 2991-2997 (1980)