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:
Jan. 05, 1999
Filed:
Sep. 12, 1997
Yoshinobu Hosoi, Aichi, JP;
Hirohisa Terabe, Aichi, JP;
Nidek Co., Ltd., Aichi, JP;
Abstract
An optometric apparatus which makes it possible to efficiently perform the masking operation for presenting a target. The optometric apparatus for examining the visual acuity of an eye to be examined by presenting a test target, includes: target presenting device for presenting a target to a predetermined presenting plane after a multiplicity of visual-acuity testing targets are divided into a plurality of sets of targets; masking device for masking a screen of the target presented by the target presenting device; a mask selection key for selecting a kind of masking by the masking device; a move key for moving a selected masking position, at least a portion of the move key being used jointly as the mask selection key; a change key for changing a masking state and used jointly with the mask selection key; and controlling circuit for controlling the kind and position of masking by the masking device on the basis of a combination of input by the change key and the mask selection key or the move key as well as the screen of the target presented by the target presenting device.