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:
Mar. 21, 1989
Filed:
Jan. 29, 1986
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An ophthalmic positioning apparatus has: an optical index projection system for projecting a positioning index onto the cornea of an eye to be examined; and optical focusing system for forming a cornea-reflected image of the positioning index on a predetermined focusing plane; an observing device for observing the cornea-reflected image of the positioning index which is formed on the predetermined focusing plane; and a moving device for moving the optical index projection system, the optical focusing system, and the observing device along at least an operation distance adjustment direction; the positioning index being adapted to allow an observer to identify an inverted state of an index image through the observing device when the positioning index is projected onto a surface position of the cornea of an eye and onto a central position of the curvature of the cornea.