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. 01, 2003
Filed:
Nov. 20, 2000
Kabushiki Kaisha Topcon, Tokyo, JP;
Abstract
A glaucoma diagnosis apparatus for determining thickness of nerve fiber layers. The apparatus includes an illuminating optical system for illuminating the ocular fundus of an eye to be examined with circularly polarized illuminating light and an imaging optical system including a CCD camera for photographing the image of an ocular fundus based on the reflected illuminating light from the ocular fundus and has a polarizing filter provided integrally with the imaging surface of the CCD camera. The filter includes repetitions of a unit platelet having a couple of polarizing microplates which transmit those linearly polarized light components crossing with each other out of the reflected illuminating light and adjacent polarizing microplates which transmit linearly polarized light components in direction crossing with both of the above/mentioned linearly polarized light components of the reflected illuminating light. Evaluation of a phase change of the circularly polarized illuminating light can be used to determine the nerve fiber layer thickness.