Eye refractive power measurement device

Details Eye refractive power measurement device Eye refractive power measurement device

2007-11-06

2007-11-06

Mack, Ricky (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

Reexamination Certificate

active

11320983

ABSTRACT:
The present invention provides a compound device having an eye refractive power measurement function and an eye accommodation function state measurement function, preventing an increase in size and cost in comparison with a known eye refractive power measurement device, and convenient for the operator even when the measurement type is changed. An eye refractive power measurement device includes a measurement type select switch (30) which selects one of at least two types of measurements including normal refractive power measurement, which measures the refractive power of the subject s eye including spherical power, cylinder power, and astigmatism axis, and eye accommodation function state measurement, which determines a change in the refractive power of the subject s eye for high-frequency components. A refractive power measurement section (40) is a multiple meridian direction refractive power measurement section which can measure the eye refractive power in two or more meridian directions. The multiple meridian direction refractive power measurement section measures the refractive power in at least two meridian directions when performing the normal refractive power measurement. The multiple meridian direction refractive power measurement section measures the refractive power in one predetermined meridian direction when performing the eye accommodation function state measurement.

REFERENCES:
patent: 4353625 (1982-10-01), Nohda et al.
patent: 5428414 (1995-06-01), Iwane
patent: 5555039 (1996-09-01), Iki et al.
patent: 5872614 (1999-02-01), Ueno
Kajita Masaoshi et al., “Eye Accomodation Function Measurement Unit”, Japanese Patent Publication No. 2003-070740, Publication Date: Mar. 11, 2003.

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