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 be

Abstract: A fundus camera, which has an illumination optical system for illuminating a fundus of an examinee's eye, an observation optical system for observing the fundus and a photographing optical system for photographing an image of the fundus, the photographing system sharing partially a common optical path with the observation optical system, comprises a beam splitter disposed in the optical path of the photographing optical system, the optical path being used in common with the observation optical system, to dispose coaxially an optical path of the illumination optical system and same of the observation optical system and the photographing optical system, and photoelectric imaging elements disposed respectively in the observation optical system and the photographing optical system.

Abstract: In an stereoscopic retinal camera having a photographing optical system capable of photographing a pair of stereoscopic fundus images by dividing a light beam reflected by the fundus of an examinee's eye into two light beams through a two-hole diaphragm, provided are an illuminating optical system for illuminating the fundus of an examinee's eye, an observing optical system for observing the fundus illuminated by the illuminating optical system, a detecting optical system for detecting the luminous flux reflected by the fundus and then directed into the observing optical system, and based on the detected result by the detecting optical system, balance of video signal strength between a pair of the fundus images is judged thereby to take a stereoscopic photograph of the fundus.

Abstract: A stereoscopic retinal camera is provided with an illumination optical system for illuminating the fundus of an examinee's eye, an observing/photographing optical system for observing and photographing an image of the fundus of the eye in a stereoscopic picture, which includes a light beam splitting optical system for splitting the light beam of the illumination optical system reflected by the fundus into a right light beam and a left light beam and a pair of image forming optical systems for forming respective images of the fundus by the two light beams, an index projecting optical system for projecting a focusing index on the examinee's eye, an index detecting optical system for detecting the focusing condition of the focusing index projected on the fundus of the eye, a judging means for judging a focusing condition by processing signals provided by the index detecting optical system, wherein one of the index projecting optical system and the index detecting optical system comprises a pair of right and left

Abstract: A stereoscopic retinal camera which enables the stereoscopic observation of the fundus of the eye and is capable of photographing the stereoscopic picture of the fundus by dividing a light beam reflected by the fundus into two light beams and transmitting the two light beams respectively along the light paths of separate image forming optical systems. And according to the stereoscopic retinal camera, each portion of the fundus and the front portion of the eye is photographed by a focus adjustment device, and an inter-image pitch between a right image and a left image of photographing the fundus and/or the front portion of the eye is corrected by an optical correcting device, whereby the inter-image pitch caused by a difference of refracting power or by a change of stereoscopic visual angle is obtainable not to be changed.

Abstract: A stereoscopic retinal camera capable of photographing the stereoscopic picture of the fundus by dividing a light beam reflected by the fundus into two light beams and transmitting the two light beam respectively along the light paths of separate image forming optical systems, the stereoscopic retinal camera comprising photographing diaphragms having two apertures for dividing the light beam reflected by the fundus, disposed in a conjugate relation with respect to the pupil of the examinee's eye through an objective lens so that a photographing image of the fundus of the eye may appear stereoscopic properly based on a stereobase determined on the pupil, the respective apertures of photographing diaphragms having a longer vertical length than a width.