Instrument for measuring a refractive power

Details Instrument for measuring a refractive power Instrument for measuring a refractive power

2008-06-10

2009-10-20

Hasan, Mohammed (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S208000

Reexamination Certificate

active

07604352

ABSTRACT:
An instrument for measuring a refractive power includes a target, a target projecting unit, a measurement light projecting unit, a light receiving unit, a unit for performing a normal refractive power measurement, a judgment unit, and a unit for performing a high-speed refractive power measurement. The unit for performing a normal refractive power measurement measures a normal refractive power of an examined eye based on received light data. The judgment unit judges reliability of the received light data or the refractive power measurement. The unit for performing a high-speed refractive power measurement measures a refractive power of the examined eye faster than the unit for performing a normal refractive power measurement in response to a judgment result of the judgment unit.

REFERENCES:
patent: 4526451 (1985-07-01), Nohda
patent: 5428414 (1995-06-01), Iwane
patent: 5561482 (1996-10-01), Miyake
patent: 5612754 (1997-03-01), Tanaka
patent: 6-165757 (1994-06-01), None
patent: 7-213485 (1995-08-01), None
patent: 8-191795 (1996-07-01), None

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