Patent ID: RE45013

Claim:
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.