Abstract: An optometric apparatus 2 according to the present invention comprises a body portion 5r provided with an optical system for a right eye for projecting a chart for the right eye in order to inspect visual function of both eye of an examinee and a body portion 5l provided with an optical system for a left eye for projecting a chart for the left eye, the optical systems for the right and left eyes projecting the same fusion patterns to perform fusion of the both eyes of the examinee.

Abstract: An optometric apparatus 2 according to the present invention comprises a body portion 5r provided with an optical system for a right eye for projecting a chart for the right eye in order to inspect visual function of both eye of an examinee and a body portion 5l provided with an optical system for a left eye for projecting a chart for the left eye, the optical systems for the right and left eyes projecting the same fusion patterns to perform fusion of the both eyes of the examinee.

Abstract: A non-contact type tonometer in which a stream of air is blown onto an eye to be examined by air stream blowing means, the deformation of a cornea caused by the air stream blowing means is optically detected by a cornea deformation detection optical system, and a control circuit calculates out the eye pressure of the examined eye on the basis of the result of the detection by the cornea deformation detecting optical system. Here, the quantity of the reflected light of a light beam projected onto the eye to be examined is obtained by a signal processing circuit. The above-mentioned control circuit compares with one another a plurality of light quantity data obtained by the signal processing circuit to make a judgement on whether the eye to be examined is a human eye or a model eye.

Abstract: In the non-contact intraocular pressure measuring apparatus for measuring the intraocular pressure of the eye to be examined for a suitable measurement time, after alignment of the apparatus main body with the eye to be examined is performed, the time required for charging the condenser is calculated based on current supply time for the rotary solenoid at the time of the previous intraocular pressure measurement. When the calculated charging time elapses, the desired quantity of current is supplied from the condenser to the rotary solenoid, allowing the air supply unit to spray air to the cornea of the eye to be examined. The cornea is transfigured and flattened by the sprayed air. At the same time, intraocular pressure measuring light is illuminated from the intraocular pressure measuring optical system to the flattened cornea. The reflected light therefrom is detected to calculate intraocular pressure value of the eye to be examined.

Abstract: A noncontact type of tonometer is provided which includes air injection device (70) for jetting a fluid from a nozzle (18) onto a cornea (C) of a subject's eye (E), an alignment light projecting optical system (30) for projecting a beam of light onto the cornea (C), and a corneal deformation detecting optical system (60) for detecting the deformation of the cornea (C). The number of times up to which the air injection device (70) has jetted the fluid is counted by a counter (82), and the count is displayed on a monitor (M).

Abstract: A noncontact type tonometer capable of accurately measuring intraocular pressure of a subject's eye even if the intraocular pressure is much higher than normal. The noncontact type tonometer comprises a fluid discharging device for discharging fluid toward a cornea of the eye, a corneal transfiguration detecting portion for detecting the corneal transfiguration, a pressure detecting portion for detecting discharge pressure of the fluid, and a delay circuit for determining the precise moment for stopping the operation of the fluid discharging means according to the discharge pressure detected by the pressure detecting means.

Abstract: In order to detect an alignment state while watching an index image, illumination light is first projected onto an anterior segment of a subject's eye (E) from LEDs (21), and then light emitted by another LED (31) is guided to a cornea (C) through an alignment light projecting optical system (30). The light emitted by the LEDs (21, 31) and reflected by the subject's eye (E) is imaged on a CCD camera (26) through an image-formation optical system (20). An index image (SP) and an anterior segment image (E') which are of the reflection light guided to the CCD camera (26) are displayed on a screen (28). The index image (SP) is received by a sensor (46). Based on information about received light obtained by the sensor (46), a comparator (47) detects information about alignment of the subject's eye (E) with an instrument body. According to a detection result obtained by the comparator (47), a display state of the display (28) is changed, so that an operator judges that a desired state of alignment is nearing.

Abstract: The present invention relates to an aspirator for aspirating materials to be removed within the eyeball. The materials are an infusion or the viterous body.A conventional aspirator permits no easy provision of an arbitrary pressure. In accordance with the present invention, a pressure adjusting unit (90) is disposed to connect an accommodating unit (100) to the air through an opening (96) of a variable size.For such a conventional aspirator, it is required that aspiration should be interrupted as a bottle is full with the removed materials. For the present invention, there are provided a first accommodating unit (2100), a second accommodating unit (2101) and a third accommodating unit (2102). The third accommodating unit (2102) has a capacity larger than each of the first and second accommodating units (2100, 2101). These accommodating units are connected.Furthermore, such a conventional aspirator may not ensure a safety in surgery.

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.