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:
Nov. 07, 1989
Filed:
Mar. 03, 1989
Kyoji Sekiguchi, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An ophthalmic measuring apparatus has a corneal shape measuring system projecting a first target image onto the cornea of an eye to be examined and receiving the corneal reflection image of the first target image by a first photodetector device to obtain information on the corneal shape, a refractive power measuring system projecting a second target image onto the eye fundus of the eye to be examined and receiving the corneal reflection image of the second target image by a second photodetector device to obtain information on the refractive power of the eye, a signal processing device selectively receiving the output of the corneal shape measuring system or the refractive power measuring system to calculate the corneal shape or the refractive power of the eye, and a measuring mode selecting device connected to the signal processing device to select a single measurement of the corneal shape of refractive power of the eye, or successive measurements of both.