Eye refractive power measurement apparatus

Details Eye refractive power measurement apparatus Eye refractive power measurement apparatus

2007-10-02

2007-10-02

Sugarman, Scott J. (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S206000

Reexamination Certificate

active

11188628

ABSTRACT:
An eye refractive power measurement apparatus capable of accurate measurement while preventing noise light from entering a photodetector even a measurement target is moved in an optical-axis direction, has a measurement optical system including an optical axis, a hole mirror having an aperture and a reflective surface, a concave mirror, an optical system projecting measurement light from the target onto a fundus via the aperture and the concave mirror, and an optical system having an image-forming member and the photodetector photo-receiving the light reflected from the fundus via the concave mirror, the reflective surface and the image-forming member, a unit moving the target and the image-forming member or photodetector in the direction to have a positional relationship optically conjugate with the fundus, and a calculation part obtaining eye refractive power based on a travel position or amount of the image-forming member or photodetector and an output from the photodetector.

REFERENCES:
patent: 5309186 (1994-05-01), Mizuno
patent: 6354705 (2002-03-01), Hirohara et al.
patent: 2005/0068497 (2005-03-01), Hanebuchi et al.
patent: A 4-73038 (1992-03-01), None
patent: A 2000-126133 (2000-05-01), None
patent: A 2002-336200 (2002-11-01), None

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