46 results about "Applanation tonometer" patented technology

An improved applanation tonometer for measuring the intraocular pressure of an eye is configured for use with a conventional slit lamp. This applanation tonometer has a force sensor that senses the force applied by an applanation probe to flatten the cornea of the eye, while the cornea is viewed through the probe using the slit lamp. The force sensor generates a signal that corresponds to the applanation force and transmits the signal to a display and/or a data storage device.

An applanation tonometry system, for measuring pressure within an eye, the tonometry system comprising: an applanation tonometer device for providing specific applanation pressure to a plurality of locations on an eye; an electrical process controller for measuring pressure within the eye; and a tonometer hands free holder adapted to secure the tonometer device over the eye whilst measuring the pressure within the eye.

The invention relates to a contact applanation tonometer. The contact tonometer comprises a probe, a light source, a first image sensor, a convex lens, a strain gauge, a microprocessor and a display memory. The probe is in a circular truncated cone shape with small bottom and large top, and is made from a transparent optical material; an inclined plane is arranged at the lateral surface of the probe; the width d of the inclined plane is 3-10 millimeters; an elastic beam is fixedly installed at the upper end of the probe; the external end of the elastic beam is fixedly connected with the lower end of a housing; the strain gauge is installed on the elastic beam; the light beams emitted by the light source are perpendicularly incident to the upper end of the probe after being collimated to be parallel beams by the convex lens; and after sequentially going through the total reflection on the lateral surface and the lower bottom surface of the probe, and the reflection on the inclined plane of the probe, the light beams directly enter the first image sensor. The contact tonometer can continuously and dynamically detect multiple intraocular tension values during measurement of the intraocular tension.

There is disclosed herein an applanation tonometer and more particularly a new form of disposable tip cover therefor. The tonometer includes a fiber optic array cylinder. A disposable tip cover comprising a translucent and light diffusing film is used on the exterior tip of the cylinder. The tip cover can be retained on the cylinder by sandwiching the cover between a pair of inner and outer flexible rings, the inner ring being attachable to the tip of the fiber optic array cylinder.

The invention discloses a measuring head and a non-contact tonometer calibrating device and method. The measuring head comprises a shell substrate, and an air inlet, a light guide column, a pressure sensor, a light-emitting device and a reflector which are arranged on the shell substrate; an air path is arranged in the air inlet and connected with the pressure sensor in a sealed mode, and the pressure sensor is used for detecting an air pressure signal of airflow sprayed by the non-contact tonometer; the light guide column is installed in the center of the air inlet and used for guiding light,and the curvature radius of the front end surface of the light guide column is matched with the curvature radius of the front surface of a real human cornea; the light-emitting device is installed onthe inner side of the light guide column and connected with the light guide column in the air inlet direction, light beams emitted by the light-emitting device are conducted out through the light guide column and received by the tonometer, and the light beam emitting time is related to the numerical value of an air pressure signal; and the reflector is arranged on the side edge of the air inlet and used for assisting in adjusting the angle of the measuring head. Good consistency of performance of the calibrating device is guaranteed, and long-term stability and accuracy of the calibrating device are improved.

The invention discloses an ophthalmology testboard and a tonometer. The ophthalmology testboard comprises two sets of symmetrically arranged supporting frames, and a head supporting plate arranged between the two sets of supporting frames in a crossing manner. A movable eyelid opening device is further arranged above each set of supporting frame, the head supporting plate is movable, the head supporting plate and the eyelid opening devices are connected through a driving mechanism, and when the head of a to-be-detected ophthalmology patient is placed on the head supporting plate and eyes correspond to the eyelid opening devices and the head presses the head supporting plate downwards and forcibly, the eyelid opening devices are driven to open the eyes of the patient. On one hand, the patient can be forced to open the eyes for detection, on the other hand, the size of the eyes can be opened according to reality, and pressure can be properly exerted on the head supporting table according to feelings.

The proposed combination device combines any tonometric metrology with a drug application to administer glaucoma medication on an eye. Several technical concepts are proposed and exemplary embodiments for rebound tonometry and air-puff tonometry are shown. However other methods such as optical coherence elastography (OCE) could also be used. The Solutions provide home care tonometry offerings which host the capability to administer glaucoma medication.

An ophthalmological analysis system, comprising: an air-puff generating device configured to apply an air-puff to a user's at least one eye; and at least one sensors board configured to detect and record deformation of a cornea of the user during the air-puff; wherein the detection is a three dimensional (3D) active stereo detection; the sensors board further configured to find two applanation points and hysteresis of the cornea and to calculate intraocular pressure in the user's at least one eye accordingly.

Provided herein are systems and methods to measure the intraocular pressure, ocular tissue geometry and the biomechanical properties of an ocular tissue, such as an eye-globe or cornea, in one instrument. The system is an optical coherence tomography subsystem and an applanation tonometer subsystem housed as one instrument and interfaced with a computer for at least data processing and image display. The system utilizes an air-puff and a focused micro air-pulse to induce deformation and applanation and displacement in the ocular tissue. Pressure profiles of the air puff with applanation times are utilized to measure intraocular pressure. Temporal profiles of displacement and/or spatio-temporal profiles of a displacement-generated elastic wave are analyzed to calculate biomechanical properties.

An improved apparatus and method of intraocular pressure determination is disclosed in which applanation tonometry is done with an ultrasonic transducer. The method allows for increased accuracy of intraocular pressure determination based upon adjustment of applanation tonometry for subjacent corneal thickness. The device allows for the operator to view the corneal surface and the pattern of dye to determine the precise endpoint of applanation.

The invention provides an ultrasonic tonometer, which can monitor the ultrasonic output while suppressing the influence on the irradiation of ultrasonic waves. An ultrasonic tonometer for measuring the intraocular pressure of an eye to be examined is provided with: an ultrasonic wave generation unit that has an oscillator and generates ultrasonic waves toward the eye to be examined; a detection unit that detects the output of the ultrasonic wave generation unit; and a control unit that monitors a detection signal of the detection unit, the detection unit being disposed outside an irradiation path of the ultrasonic waves irradiated from the ultrasonic wave generation unit toward the eye to be examined.