Abstract: An apparatus for ascertaining the number of cells of an endothelium of a cornea of a subject's eye includes a display for displaying an image of cells of an endothelium of a photographed cornea, square meshes for partitioning the image of the cells displayed on the display by the unit area, and an enlarging device for enlarging and displaying an area partitioned by one of the square meshes on the display. The square meshes and the image are correlatively moved in a right or left direction on the display. An operator counts the number of the cells per unit area in an enlarged image, so that the operator ascertains the total number of the cells of the corneal endothelium.

Abstract: Illumination light emitted by an illuminating light source, such as a halogen lamp or xenon lamp, is projected onto a subject's eye via an illuminating optical system placed in the main body of an ophthalmologic apparatus, while light reflected by the eye is guided to either of a color television camera and an infra-red television camera mounted in the body via an observing and photographing optical system and, in accordance with video signals delivered by the television cameras, an image of the eye is displayed on a color liquid crystal monitor mounted in the main body.

Abstract: An apparatus for photographing an endothelium of a cornea comprising an apparatus optical system including an anterior portion observing optical system for observing the anterior portion of an eye to be tested, an illumination optical system for illuminating the cornea of the eye, and an observing or photographing optical system for observing or photographing the endothelium of the cornea by receiving the light reflected on the endothelium of the cornea which is illuminated by the illumination optical system, the apparatus optical system being provided with a fixation mark light projecting system capable of changing a position where a fixation mark is presented, in order to change a direction in which the eye is fixedly gazed.

Abstract: A surgical cutting instrument which comprises an outer tubular member having a closed distal end closed and also having an aperture defined therein adjacent to the closed distal end which is in communication with the hollow of the outer tubular member and an inner tubular member having an open distal end which is slidably disposed in the outer tubular member such that the inner tubular member slides along its longitudinal axis first and second positions. The distal end of the inner tube has also has a scraper region defined therein. The scraper region is curled so as to represent a curved shape corresponding to a portion of a circle having a diameter greater than the outer diameter of the inner tubular member, so that when the inner tubular member is moved within the outer tubular member, the curled scraper region can be forcibly brought into sliding contact with an inner peripheral surface of the outer tubular member.

Abstract: A noncontact type tonometer projects a fluid toward an eye-to-be-tested and obtains a measured value of eye pressure from a relation between transfigurations of the eye due to the fluid projection and the pressure projecting the fluid. A detecting circuit senses a pulse wave of the person-to-be-tested and a calculating circuit determines at least one of the maximum eye pressure value, minimum eye pressure value and average eye pressure value of the eye dependent on the maximum fluctuation width of the detected pulse wave, a fluctuating quantity of the detected pulse wave, and the measured eye pressure value. The calculation circuit determines the pulse wave fluctuating quantity at the time point when the eye pressure is measured. The pulse wave of the person may be measured at a position remote from the eye. The tonometer may also include a display for displaying the pulse wave and a display controller for displaying the time point when the eye pressure is measured.

Abstract: A surgical cutting instrument having an outer tubular member with a closed distal end, and an aperture therein which is adjacent to the closed distal end and which is in communication with the hollow of the outer tubular member. The instrument also includes an inner tube slidably disposed in the outer tube such that it reciprocates between first and second positions. The instrument also has a suction device which draws a portion of an object inwardly through the aperture. The inner tubular member has first and second edges which cooperate with the aperture such that when the suction device draws a first portion of the object into the aperture, the first edge cuts this portion away as the inner tubular member moves from the first position to the second position. However, when the suction device draws a second portion of the object into the aperture, the second edge cuts this portion away as the inner tubular member moves from the first position to the second position.

Abstract: A noncontact type tonometer projects a fluid toward an eye-to-be-tested and obtains a measured value of eye pressure from a relation between transfigurations of the eye due to the fluid projection and the pressure projecting of the fluid. A detecting circuit senses a pulse wave of the person-to-be-tested and a calculating circuit determines at least one of the maximum eye pressure value, minimum eye pressure value and average pressure value of the eye dependent on the maximum fluctuation width of the detected pulse wave, a fluctuating quantity of the detected pulse wave, and the measured eye pressure value. The calculation circuit determines the pulse wave fluctuating quantity at the time point when the eye pressure is measured. The pulse wave of the person may be measured at a position remote from the eye. The tonometer may also include a display for displaying the pulse wave and a display controller for displaying the time point when the eye pressure is measured.

Abstract: An ophthalmological instrument for the use of both corneal configuration and intraocular pressure measurement has alignment watching means for watching an alignment completion state upon receipt of an alignment completion signal which is output by alignment detecting means for detecting the alignment of an apparatus body with respect to an eye to be tested, corneal configuration measuring means for projecting a ring target mark onto the cornea of the eye and measuring a corneal configuration with reference to the ring target image, noncontact type intraocular pressure measuring means for discharging fluid toward the cornea in order to transfigure the cornea and measuring the intraocular pressure with reference to the amount of such transfiguration, and automatic executing means for executing the corneal configuration and intraocular pressure measurements in such a manner as that data of the ring target image is intaken in accordance with output of the alignment watching means in order to obtain data regarding

Abstract: A noncontact type tonometer includes a fluid discharging device for discharging a fluid towards the cornea of an eye to be tested; an alignment detecting device for detecting an alignment between the axis of a fluid discharge of the fluid discharging device and the vertex of the cornea and for outputting an alignment signal; and a controlling device for determining whether or not the alignment has been completed upon receipt of the alignment signal from the alignment detecting device and outputting an alignment completion signal when the alignment has been completed. A fluid discharge of the fluid discharging device is automatically performed based on the alignment completion signal.

Abstract: An eye fundus camera adapted to be mounted with a first (12) and a second (20; 26, 27) apparatus for observing and/or photographing the eye fundus, and including a movable mirror (18) moved between a first position where it admits light from the eye fundus to the first apparatus (12) and a second position where it deflects the light toward the second apparatus (20; 26, 27), whereby various modes of operation can be carried out.

Abstract: Eye fundus camera having an illumination system provided with a fluorescence exciting filter which can be retractably inserted into the illumination optical path for fluorescent photographing. The intensity of illumination is increased in fluorescent photographing. The data projecting system in the camera includes a data illumination optical path for leading a light from the illumination system and a shutter is provided for at least decreasing the illumination of the data projecting system in fluorescent photographing.

Abstract: Eye fundus camera including a photographing optical system comprised of an objective lens, an imaging lens and a magnification power changing lens device. The power changing lens device is movable in axial direction for effecting focusing.