| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely correct intraocular pressure by precisely measuring the thickness of the cornea of an eye to be examined. <P>SOLUTION: This non-contact type tonometer includes a fluid blowing means for blowing a fluid on the cornea through a nozzle and a deformation detecting means for detecting the deformed state of the cornea and also includes a condensing optical system which is a projection optical system for projecting the light emitted from a photographing light source on the anterior eye part through a nozzle and condenses the light emitted from the light source on the anterior eye part, a projection optical system having a luminous flux restricting means for projecting the luminous flux emitted from the light source and passed through the nozzle on the anterior eye part and restricting the luminous flux passed through the outside of the nozzle, and the anterior eye part cross-section photographing optical system having an imaging element for taking the cross-sectional image of the anterior part and an imaging lens for guiding the reflected light from the anterior part by the projection optical system to the imaging element and is arranged so that the light cross section of the projected image by the projection optical system, the main plane of the imaging lens and the extension surface of the imaging surface of the imaging element cross to each other on one axis. <P>COPYRIGHT: (C)2009,JPO&INPIT |
