Noncontact tonometer for measuring intraocular pressure

摘要

A noncontact tonometer for measuring intraocular pressure is provided. When a rotary solenoid (7) is supplied with electric power, a piston (4) within a cylinder (2) is moved up, and thereby air is jetted through a nozzle (9) of a head (3) toward an eye (H) of a subject. At the same time, infrared rays are projected onto the eye (H) from a light source (11). Reflected light from a cornea of the eye (H) is received by a light receiving sensor (12). A signal generated by the light receiving sensor (12) is transmitted to a control circuit (16) via a flat-state detecting circuit (13). As a result, the intraocular pressure of the eye (H) is measured. The noncontact tonometer further includes two condensers (17, 18). A command from the control circuit (16) is input to a condenser switching portion (20) by operating a driving switch (21). Thereby, one of the condensers (17, 18) is selected to supply the rotary solenoid (7) with the electric power.