The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1992
Filed:
Jul. 17, 1991
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A non-contact tonometer has a fluid projecting device for compressing fluid in a compression chamber and projecting the fluid to the cornea of an eye to be examined located at a predetermined distance therefrom. The fluid injecting device is capable of selecting a first range as a pressurizing range for measurement of intraocular tension and a second range including a value higher in the degree of pressurization relative to the first range. The tonometer also includes a measuring device for detecting a predetermined deformation of the cornea of the eye to be examined caused by the compressed fluid and measuring the value of the intraocular tension of the eye to be examined, a change-over device for changing over the pressurizing range for measurement of intraocular tension between the first range and the second range, a state detecting device for effecting at least one of the detection of the fact that measurement is impossible by the measuring device and the detection of the replacement of the eye to be examined by another eye, and a control device for operating the change-over device on the basis of at least one of the output of the state detecting device and the measured value measured by the measuring device.