Abstract: A non-contact type tonometer includes a fluid blowing device which blows fluid against a cornea of an eye of an examinee; an intraocular pressure measurement part which detects a deformed state of the cornea caused by the blown fluid and determines intraocular pressure of the examinee's eye based on a result of detection of the deformed state; a pulsation detection part which detects pulsation of the examinee; a measurement timing determination part which can determine a measurement timing based on the detected pulsation to obtain a predetermined number of results of measurement on the intraocular pressure in synchronization with different phase points in the pulsation; a command signal input part which inputs a command signal for execution of the measurement; and a control part which outputs a control signal for controlling driving of the fluid blowing device based on the determined measurement timing and the input command signal.

Abstract: An ophthalmic apparatus comprising: an illuminating optical system which projects light to an examinee' eye; an image pickup unit which color-photographs an interference image caused by interference of light reflected by a tear layer of the eye; and an analyzing part which dissolves the photographed interference image to a plurality of color components, determines an appearance of interference stripes of each color component based on a signal of each color component, and obtains a value indicating a dry eye symptom based on at least one of the number of interference stripes of each color component and changes in signal level of each color component.

Abstract: A noncontact type tonometer monitors the rate of change X(t) in pressure between a standard curve and a measured curve. If X(t) exceeds a value of 1.3, the application of air pressure is stopped to prevent an abnormal rise in pressure. If X(t) is equal to 1, then the measured curve follows the standard curve and correction is not required. If X(t) is not equal to 1, an error condition exists and an amended time t′ is calculated based on the rate of change X(t). Instead of a calculated amended time, an approximated standard curve can also be determined based on either an equation stored in a memory or by matching the measured curve with one of a plurality of standard curves stored in memory.

Abstract: A non-contact type tonometer includes a compressed air blowing unit which compresses air in a cylinder by means of a piston disposed within the cylinder and blows the compressed air to a cornea of an examinee's eye; a driving unit which drives the piston; a pressure sensor which detects pressure of the air in the cylinder; an optical system which projects light to the cornea; a photosensor which detects, of the light projected by the optical system, reflection light reflected from the cornea; and a controller which obtains a change in pressure for a predetermined time based on a detection result by the pressure sensor when the photosensor detects a predetermined change amount of the reflection light after the driving unit drives the piston to start blowing of the compressed air to the cornea from the compressed air blowing unit, and changes a timing of stopping supply of driving power to the driving unit based on the obtained change in pressure.

Abstract: A non-contact type tonometer includes a fluid blowing device which blows fluid against a cornea of an eye of an examinee; an intraocular pressure measurement part which detects a deformed state of the cornea caused by the blown fluid and determines intraocular pressure of the examinee's eye based on a result of detection of the deformed state; a pulsation detection part which detects pulsation of the examinee; a measurement timing determination part which can determine a measurement timing based on the detected pulsation to obtain a predetermined number of results of measurement on the intraocular pressure in synchronization with different phase points in the pulsation; a command signal input part which inputs a command signal for execution of the measurement; and a control part which outputs a control signal for controlling driving of the fluid blowing device based on the determined measurement timing and the input command signal.

Abstract: An ophthalmic apparatus for observing an eye to be examined is disclosed. This apparatus includes an observation optical system including an objective lens, for observing the eye through the objective lens; an illumination optical system including an illumination light source, for illuminating the eye through the objective lens; a polarization beam splitter having a property of transmitting one of linear polarized light beams that mutually perpendicularly intersect, and reflecting another linear polarized light beam, the polarization beam splitter being disposed opposite to the eye to be examined with respect to the objective lens, whereby aligning optical paths of the illumination and observation optical systems in a mutually coaxial relation; and a ¼ wave plate disposed between the objective lens and the eye to be examined.

Abstract: A non-contact type tonometer includes a compressed air blowing unit which compresses air in a cylinder by means of a piston disposed within the cylinder and blows the compressed air to a cornea of an examinee's eye; a driving unit which drives the piston; a pressure sensor which detects pressure of the air in the cylinder; an optical system which projects light to the cornea; a photosensor which detects, of the light projected by the optical system, reflection light reflected from the cornea; and a controller which obtains a change in pressure for a predetermined time based on a detection result by the pressure sensor when the photosensor detects a predetermined change amount of the reflection light after the driving unit drives the piston to start blowing of the compressed air to the cornea from the compressed air blowing unit, and changes a timing of stopping supply of driving power to the driving unit based on the obtained change in pressure.

Abstract: An ophthalmic apparatus for observing an eye to be examined is disclosed. This apparatus includes an observation optical system including an objective lens, for observing the eye through the objective lens; an illumination optical system including an illumination light source, for illuminating the eye through the objective lens; a polarization beam splitter having a property of transmitting one of linear polarized light beams that mutually perpendicularly intersect, and reflecting another linear polarized light beam, the polarization beam splitter being disposed opposite to the eye to be examined with respect to the objective lens, whereby aligning optical paths of the illumination and observation optical systems in a mutually coaxial relation; and a ¼ wave plate disposed between the objective lens and the eye to be examined.

Abstract: An ophthalmic apparatus for measuring dryness of a cornea of an eye to be examined, the apparatus comprising a projecting optical system including a light source for projecting measurement light onto the cornea, a detecting optical system including a photodetector for detecting reflected light from a tear film by projecting the measurement light, an arithmetic device for measuring time-varying changes in the dryness of a predetermined measurement region based on a result detected by the photodetector, and an output device for outputting a measurement result obtained by the arithmetic device.

Abstract: A noncontact type tonometer monitors the rate of change X(t) in pressure between a standard curve and a measured curve. If X(t) exceeds a value of 1.3, the application of air pressure is stopped to prevent an abnormal rise in pressure. If X(t) is equal to 1, then the measured curve follows the standard curve and correction is not required. If X(t) is not equal to 1, an error condition exists and an amended time t′ is calculated based on the rate of change X(t). Instead of a calculated amended time, an approximated standard curve can also be determined based on either an equation stored in a memory or by matching the measured curve with one of a plurality of standard curves stored in memory.

Abstract: A noncontact type tonometer monitors the rate of change X(t) in pressure between a standard curve and a measured curve. If X(t) exceeds a value of 1.3, the application of air pressure is stopped to prevent an abnormal rise in pressure. If X(t) is equal to 1, then the measured curve follows the standard curve and correction is not required. If X(t) is not equal to 1, an error condition exists and an amended time t′ is calculated based on the rate of change X(t). Instead of a calculated amended time, an approximated standard curve can also be determined based on either an equation stored in a memory or by matching the measured curve with one of a plurality of standard curves stored in memory.

Abstract: A non-contact type tonometer is disclosed, wherein a fluid blowing device blows a compressed air against a cornea of an examinee's eye, a deformation detection device detects a corneal deformed state caused by the fluid, a pressure detection device detects the fluid pressure to be blown by the fluid blowing device, a memory samples data on time-varying pressure detected by the pressure detection device at predetermined time intervals and stores them, and a calculation device takes a predetermined amount of pressure data from those stored in the memory, the pressure data being within a predetermined duration determined relative to the reference time at which a predetermined deformation of the cornea is detected by the deformation detection device. Then, the calculation device calculates an intraocular pressure of the examinee's eye based on the taken pressure data.

Abstract: In a non-contact type tonometer for blowing compressed gas against an examined eye through a nozzle, when a piston returns to an initial position by a biasing unit for biasing so as to return the piston to the initial position, a piston driving unit is actuated so as to attenuate the piston return speed by applying a force in the upwardly moving direction. Further, the piston is attached a piston rod so as to move in the axial direction of a cylinder, and is provided a gas passage which is closed when the gas is compressed and is opened when the piston returns to the initial position by the movement of the piston rod. Thus, the air compression chamber within the cylinder is caused to conductively connect to the atmospheric open chamber to thereby restrain the interior of the cylinder from becoming negative in pressure. In this way, it is possible to suppress the sucking-in of tears, dust, eyelashes and the like through the nozzle as effectively as possible with a simple structure.

Abstract: An non-contact type tonometer is disclosed, wherein a compressed fluid is blown against an examinee's eye for deforming the cornea of the eye and detecting a corneal deformed state to measure intraocular pressure of the examinee's eye. This tonometer controls the blowing of fluid by stopping to compress the fluid when a predetermined condition set with reference to the detected results in a deformation start time of the cornea is fulfilled. This makes it possible to measure the intraocular pressure of the examinee's eye by blowing the fluid at lower pressure, thereby to reducing disagreement to the examinee, without applying excessive pressure of fluid to the examinee's eye.

Abstract: An ophthalmic apparatus including measuring device, comprises a moving device for moving the measuring device relatively to the eye, an alignment detecting device for detecting alignment condition between the measuring device and the eye by projecting an alignment target to the eye, then detecting an image of the target, a movement-controlling device for performing alignment by driving and controlling the moving device based on the detected results, a returning device for causing the measuring device to return to a standard position, a returning-instruction device for instructing the returning device to start movement, a returning-control device for controlling movement of the returning device in response to instruction by the returning-instruction device, a risk sensing device for sensing whether there is risk that the apparatus touches the eye caused by movement of the returning device, and a prohibiting device for prohibiting the returning device from moving to all or predetermined directions at the time w

Abstract: An ophthalmic apparatus including a measuring device for measuring an eye to be examined comprises a moving device for moving the measuring device with respect to the eye to be examined, a detecting device for detecting an alignment state between the measuring device and the eye, a control device for controlling operation of the moving device on the basis of detection results of the detecting device, a judging device for judging the alignment state on the basis of the detection results of the detecting device, a trigger signal generating device for generating trigger signals to make the measuring device start measurement based on judgement results of the judging device, and a stopping device for stopping operation of the moving device for a first predetermined time after completion of measurement by the measuring device.

Abstract: An ophthalmologic alignment device for aligning a measuring system at a predetermined position for an eye to be examined. The user moves the measuring system with a joystick for aligning purposes while observing a frontal eye image with an observation unit. A second moving unit further moves the measuring system moved by the user. An index projection/detection system projects an index onto the eye and detects the reflected index. The controller causes drivers to drive the second moving unit on the basis of the result of the detection of the index projection/detection system. A mode switch switches the movement of the measuring system from a mode in which the observation unit is moved by the first moving unit to a mode in which the observation unit is moved by the second moving unit, whereby the alignment of the eye and the measuring system is achieved easily and with high accuracy, irrespective of the degree of the user's skillfulness in handling the alignment device.

Abstract: A noncontact type tonometer comprising with a nozzle for directing fluid into a cornea of a patient's eye and for deforming the cornea from a normally convex state, through a flat state, to a concave state, a detector for detecting fluid pressure within the nozzle and for generating pressure data corresponding to the fluid pressure, an optical detector for optically detecting corneal deformation and for generating optical data corresponding to a deformation state from the normally convex state to the concave state, a generator for generating predetermined time interval data according to a predetermined time interval, a clock, cooperable with the optical detector for optically detecting corneal deformation, for detecting an elapsed time interval for the cornea to deform to the flat state from the normally convex state and for generating elapsed time interval data corresponding thereto, a predictor for predicting an optimal time interval for the cornea to deform from the normally convex state to the flat state

Abstract: An analyzing apparatus provided with a spectroscopic photometer, in which light emitted by a deuterium lamp enters a flow cell; light transmitted by the flow cell is divided into two light beams by means of a beam splitter, one of which is received by a detecting element for sample measurement and the other of which is received by a detecting element for monitoring through a filter transmitting only light in a predetermined wavelength region, which is not essentially absorbed by the sample; and a signal processing device compares the output signal of the detecting element for sample measurement with that of the detecting element for monitoring and effects necessary operations.