Non-contact ultrasonic tonometer
AssigneeNidek Co., Ltd.
InventorTetsuyuki Miwa
Life of this patent
Estimating the term…
Abstract
A non-contact ultrasonic tonometer for measuring intraocular pressure of an examinee's eye, in non-contact manner by use of an ultrasonic wave comprises: a probe including a vibrator for making the ultrasonic wave incident on the examinee's eye and a sensor for detecting the ultrasonic wave reflected from the examinee's eye; and an observation optical system for observing an anterior segment of the eye, wherein the probe is placed in an optical path of the observation optical system, and the observation optical system forms an image of the anterior segment through a surrounding region of the probe.
Claims15
A non-contact ultrasonic tonometer for measuring intraocular pressure of an examinee's eye in a non-contact manner by use of an ultrasonic wave, the tonometer comprising:
- a fixation target projection optical system provided with a light source for fixation target projection to project a fixation target onto the eye to cause the eye to view the fixation target;
- a probe including a vibrator for making the ultrasonic wave incident on the examinee's eye and a sensor for detecting the ultrasonic wave reflected from the examinee's eye, the probe being configured to measure the intraocular pressure based on an output signal from the sensor;
- and
- an observation optical system for observing an anterior segment of the eye,
- wherein the probe is placed in an optical path of the observation optical system and has an aperture through which fixation target light from the light source is allowed to pass, and
- the observation optical system forms an image of the anterior segment through a surrounding region of the probe.
A non-contact ultrasonic tonometer for measuring intraocular pressure of an examinee's eye in a non-contact manner by use of an ultrasonic wave, the tonometer comprising:
- a fixation target projection optical system provided with a light source for fixation target projection to project a fixation target onto the examinee's eye to cause the eye to view the fixation target;
- a probe including a vibrator for making the ultrasonic wave incident onto the examinee's eye and a sensor for detecting the ultrasonic wave reflected from the examinee's eye, the probe being configured to measure the intraocular pressure based on an output signal from the sensor;
- an observation optical system for observing an anterior segment of the eye;
- and
- a refractive power measurement optical system configured to project measurement light onto a fundus of the examinee's eye and cause a photo-receiving device to receive reflection light from the fundus, the refractive power measurement optical system being arranged to measure refractive power of the examinee's eye based on an output from the photo-receiving device,
- wherein the probe is placed out of an optical path of the fixation target projection optical system, the observation optical system, and the refractive power measurement optical system;
- and
- wherein the tonometer is structured such that it does not contact the examinee's eye during measurement of the intraocular pressure of the examinee's eye.
A non-contact ultrasonic tonometer for measuring intraocular pressure of an examinee's eye in a non-contact manner by use of an ultrasonic wave, the tonometer comprising:
- a reflecting member for reflecting the ultrasonic wave propagating through air;
- an observation optical system for observing an anterior segment of the examinee's eye, the observation optical system being placed so that at least a portion of its optical axis is positioned on a path of the ultrasonic wave between the eye and the reflecting member, a refractive power measurement optical system being configured to measure the refractive power of the examinee's eye;
- a fixation target projection optical system to project a fixation target onto a fundus of the examinee's eye to cause the eye to view the fixation target;
- and
- a probe including a vibrator for making the ultrasonic wave incident onto the examinee's eye and a sensor for detecting the ultrasonic wave reflected from the examinee's eye through the ultrasonic wave reflecting member, the probe being placed out of optical paths of the observation optical system, the fixation target projection optical system, and the refractive power measurement optical system;
- wherein the tonometer is structured such that it does not contact the examinee's eye during measurement of the intraocular pressure of the examinee's eye.
Dependencies are inferred from the claim text.