Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-04-29
1997-09-16
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, 351221, 396 18, A61B 310
Patent
active
056686218
ABSTRACT:
A fundus camera which may maintain sufficient working distance to an eye to be examined, providing a first illumination optical system for illuminating an eye to be examined by using infrared light, a second illumination optical system for illuminating the eye to be examined by using visible light for photo-imaging with part of light path being shared with that of the first illumination optical system an alignment index projection optical system for projecting an alignment index for the adjustment of working distance onto an cornea of the eye to be examined, an observation optical system having photoelectric imaging elements for observing the images of the focusing of the alignment index image and the fundus of the eye to be examined, a first display device for displaying images formed by the photoelectric imaging elements of the observation optical system, a photographing optical system having photoelectric imaging elements for forming images of the fundus of the eye to be examined with part of light path being shared with that of the observation optical system, and a beam splitter disposed along with the light path shared by the photographing optical system and the observation optical system for reflecting the illumination light into the eye to be examined, the suitability of the alignment being determined by observing the images of the focusing of the alignment index image on the first display device.
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Dang Hung X.
Nidek Company, Ltd.
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