Photography – Body examination photography – Eye photography
Patent
1994-07-25
1996-11-05
Gellner, Michael L.
Photography
Body examination photography
Eye photography
351208, G03B 2900
Patent
active
055722660
ABSTRACT:
A fundus camera capable of adjusting a working distance between a camera body and a subject's eye quickly and easily with high accuracy and capable of observing an eye fundus image in a field of view and at a magnification each substantially same as those selected when an eye fundus is photographed. To adjust the working distance quickly and easily with high accuracy, the fundus camera has an optical member 59 provided in a projecting optical system 56 for projecting alignment light onto a subject's eye E. The optical member 59 projects split alignment images onto the eye E when the working distance W is out of a predetermined proper distance. To observe the eye fundus image in the substantially same field of view and at the substantially same magnification as those selected when the eye fundus is photographed, the fundus camera has a device for, according to power variation, changing a state of illumination light illuminating the eye E. In the fundus camera, the alignment light is projected onto the eye E, the alignment light reflected by the eye E is once converged on a point R of a photographic optical path 31 conjugate with the fundus Ef of the eye E, the reflected alignment light converged thereon is guided to a TV monitor 53 through a variable power lens 53, and the state of the illumination light illuminating the eye E is changed by the changing device to observe and photograph the eye fundus Ef.
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Chapik Daniel
Gellner Michael L.
Kabushiki Kaisha Topcon
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