Refractive power measurement apparatus

Details Refractive power measurement apparatus Refractive power measurement apparatus

2006-10-31

2006-10-31

Legesse, Nini F. (Department: 3711)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S211000, C351S212000

Reexamination Certificate

active

07128417

ABSTRACT:
A refractive power measurement apparatus capable of measuring a refractive power of an optical system to be measured with a simple constitution at low cost. The refractive power measurement apparatus includes a projection optical system which projects measurement light onto an optical system to be measured, a photo-receiving optical system provided with a photodetector which photo-receives the measurement light from the optical system to be measured and a lens system which guides the measurement light onto the photodetector, a moving device for moving the lens system within a plane intersecting at right angles with an optical axis of the photo-receiving optical system so as to form a predetermined measurement pattern image on a photo-receiving surface of the photodetector, and a calculation device for calculating a refractive power of the optical system to be measured based on the measurement pattern image.

REFERENCES:
patent: 5270749 (1993-12-01), Okumura
patent: 5309186 (1994-05-01), Mizuno
patent: 5500697 (1996-03-01), Fujieda
patent: 5767940 (1998-06-01), Hayashi et al.
patent: 1-293841 (1989-11-01), None
patent: 2-252437-1 (1990-10-01), None
patent: 10-305013 (1998-11-01), None

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