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:
Jul. 30, 2002
Filed:
Mar. 27, 2001
Nidek Co., Ltd., Gamagori, JP;
Abstract
A visual acuity examination apparatus for examining a visual acuity of an examinee by presenting an optotype to the examinee includes an optotype presenting unit which selectively presents at least one of a plurality of comparison optotypes expressed in geometrical series, the optotypes being provided to be plural in number for each visual acuity value, an input unit with which a distinction answer of the examinee with respect to the presented optotype is input, a storage unit in which an examination program which sequentially determines an optotype to be next presented based on whether the distinction answer with respect to the presented optotype is right or wrong is stored, a control unit which controls the optotype presenting unit in accordance with the examination program, and a processing unit which determines a visual acuity value of the examinee from a percentage of right answers in the distinction answers with respect to an optotype for a visual acuity value.