Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-12-08
2000-03-07
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
A61B 310
Patent
active
060330740
ABSTRACT:
The subjective eye refractive power measuring apparatus according to the present invention objectively measures the refractive power of an optical system to be tested. The subjective eye refractive power measuring apparatus comprises a measuring element that output a detection signal corresponding to the refractive power of the optical system to be tested, an arithmetic device that calculates a measured value related to the refractive power based upon an output signal from the measuring element, a determination device that determines whether or not specific conditions related to termination of a measuring operation are satisfied based upon, at least, either a measured value obtained by the arithmetic device or the length of measurement time required for measurement and a termination device that implements specific control for terminating a measuring operation when the judgement device has determined that specific conditions are satisfied.
REFERENCES:
patent: 4676004 (1987-06-01), Nakamura et al.
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patent: 4917480 (1990-04-01), Kato et al.
patent: 5309186 (1994-05-01), Mizuno
patent: 5691800 (1997-11-01), Iki et al.
Miyake Nobuyuki
Tomioka Ken
Manuel George
Nikon Corporation
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