To enlarge the field of view of an observation system, and make positioning easier.

A front eye part image of a subject eye E illuminated by a light source 14 is formed through lenses 6 and 8 at an image pickup part 9, and the front eye part image is displayed on a monitor 16 observed by an examiner. Light flux from the light source 14 to penetrate an optical member 3 is scattered by tips of eyelashes M with relation to the angle, and the tips of the eyelashes M are reflected to be white in a dark pupil, so that shading states of the eyelashes M can be easily observed. Signals of the image pickup part 9 are taken into an operation control part 15, the position of the eye is recognized, and positioning drive is conducted. Deformation signals of a cornea C obtained by a photoelectric sensor 13 by air blown from a nozzle 2 are inputted to the operation control part 15, and intraocular pressure is measured in accordance with their relation to signals of a pressure sensor in a chamber 17.