Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-07-02
1999-04-06
Dang, Hung Xuan
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 310
Patent
active
058925678
ABSTRACT:
The invention relates to an optometric apparatus the operation of which is not troublesome, and which is capable of effecting examination with high efficiency. An optometric apparatus for obtaining a correction power of refraction by examining the refractive power of an eye to be examined, comprising: a refractive-power examining device for examining the refractive power of the eye to be examined by selectively disposing in a test window corrective optical systems having various optical characteristics; storage memory for storing a plurality of different items of examination information; a display screen for displaying the examination information stored in the storage memory; and a control mechanism for providing control such that the plurality of items of examination information stored in said storage memory are displayed on the display screen, together with examination information of a present examination item.
REFERENCES:
patent: 5416540 (1995-05-01), Hayashi
patent: 5444504 (1995-08-01), Kobayashi et al.
patent: 5610671 (1997-03-01), Hosoi et al.
patent: 5627612 (1997-05-01), Hayashi
patent: 5731863 (1998-03-01), Hayashi
Hosoi Yoshinobu
Terabe Hirohisa
Dang Hung Xuan
Nidek Co. Ltd.
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