Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2007-10-02
2007-10-02
Dang, Hung (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S212000, C351S214000
Reexamination Certificate
active
11140734
ABSTRACT:
An eye refractive power measurement apparatus capable of reducing an influence of scattered light and performing measurement with high accuracy. The apparatus has a measurement optical system including a system having a light source projecting spot-shaped measurement light onto a fundus of an examinee's eye, and a system having an optical axis, a photodetector, a ring-shaped aperture, a member by which the light reflected from the fundus via a peripheral pupillary portion and the aperture forms a ring-shaped image on the photodetector, and a diaphragm of a size such that a projection region by the diaphragm on the photodetector overlaps the axis within a predetermined amount and that the reflection light forms the image within the region in projecting the measurement light onto a myopic eye with the measurable highest diopter, and a part which obtains the eye refractive power based on an output from the photodetector.
REFERENCES:
patent: 5523809 (1996-06-01), Kohayakawa
patent: 2005/0068497 (2005-03-01), Hanebuchi et al.
patent: A 01-129830 (1989-05-01), None
patent: A 01-293841 (1989-11-01), None
patent: A 05-031075 (1993-02-01), None
patent: A 08-103413 (1996-04-01), None
patent: A 11-225963 (1999-08-01), None
patent: A 2002-336200 (2002-11-01), None
Dang Hung
Martinez Joseph
Nidek Co. Ltd.
Oliff & Berridg,e PLC
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