Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-10-02
1999-05-25
Dang, Hung Xuan
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, A61B 310
Patent
active
059073888
ABSTRACT:
An ophthalmic measurement apparatus for measuring a refractive power of an eye to be examined, the apparatus comprises slit projecting optical system for scanning a fundus of the eye by a slit light bundle, detecting optical system for detecting the slit light bundle reflected by the fundus of the eye which is scanned by the slit projecting optical system, the detecting optical system includes plural pairs of photo-receiving elements which are disposed along the meridian direction corresponding to the slit scanning direction of the slit light bundle, and respective pairs of photo-receiving elements are disposed so as to be symmetric with putting an optical axis therebetween at approximately conjugate position relative to a cornea of the eye, and refractive power calculating device for calculating the refractive power of the eye which is varied at the meridian direction, based on respective phase difference signals outputted by respective photo-receiving elements of the detecting optical system.
REFERENCES:
patent: 4390255 (1983-06-01), Nohda et al.
patent: 4526451 (1985-07-01), Nohda
patent: 4702596 (1987-10-01), Nohda
patent: 4787743 (1988-11-01), Nohda
patent: 4917458 (1990-04-01), Matsumura
patent: 5214456 (1993-05-01), Gersten
patent: 5500697 (1996-03-01), Fujieda
patent: 5555039 (1996-09-01), Iki et al.
Dang Hung Xuan
Nidek Co. Ltd.
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