Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-04-30
1998-04-07
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 310
Patent
active
057370591
ABSTRACT:
An apparatus for measuring the refractive power of an optical system has a scan optical system for scanning a fundus with slit light beams, a measuring optical system for taking the slit light beams reflected from the fundus of the examined eye, a plurality of light receivers for detecting the slit light beams taken in by the measuring optical system, and a calculator for obtaining Fourier spectrums by Fourier-transforming detection signals of the plurality of light receivers and thus calculating the eye refractive power of the examined eye on the basis of predetermined frequency components of Fourier spectrums of the detection signals.
REFERENCES:
patent: 4676612 (1987-06-01), Wada et al.
patent: 5428414 (1995-06-01), Iwane
Dang Hung X.
Nikon Corporation
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