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:
Dec. 10, 1991
Filed:
Nov. 29, 1989
Yasufumi Fukuma, Tokyo, JP;
Akio Umeda, Tokyo, JP;
Ikuo Kitao, Tokyo, JP;
Noriyuki Nagai, Tokyo, JP;
Yasuhisa Ishikura, Tokyo, JP;
Kazutoshi Uchida, Tokyo, JP;
Kabushiki Kaisha TOPCON, Tokyo, JP;
Abstract
An ocular refracting power measuring system includes a projector system for projecting the image of a light source on the eyeground of an eye to be tested and a light receiving system for condensing the light beam from the eyeground onto a light receiving element disposed at a position substantially conjugate with the pupil of the eye to be tested, whereby the ocular refracting power of the eye to be tested can be measured based on the distribution of light amount on the light receiving element and variations of the distribution of light amount due to the changed amount of light in the light source.