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. 20, 2007
Filed:
Dec. 20, 2004
Miwako Hanaki, Gamagori, JP;
Naoki Isogai, Nishio, JP;
Akihiro Hayashi, Toyokawa, JP;
Nidek Co., Ltd., Gamagori, JP;
Abstract
An ocular accommodative function examination apparatus for examining an accommodative function of an examinee's eye, comprises: a fixation target presenting optical system which presents a fixation target at a presenting position to the eye, the presenting position being changeable in a direction of a visual axis of the eye; a refractive power measuring optical system which measures refractive power of the eye and includes a light projecting optical system which includes a light source and projects examination light to a fundus of the eye and a light receiving optical system which includes a light receiving element and receives the examination light reflected from the fundus; an analysis part which acquires variation in the refractive power of the eye gazing at the fixation target at a certain presenting position within a predetermined time based on output of the light receiving element, and determines the accommodative function including a range of accommodation and HFC (a frequency of occurrence of a high frequency component of accommodative microfluctuation) of the eye based on an acquired result; and an output part which outputs a result determined by the analysis part, wherein the analysis part determines presence/absence of accommodative constriction and presence/absence of accommodative spasm based on the determined range of accommodation and HFC.