Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-08-27
2000-02-29
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
A61B 310
Patent
active
060300817
ABSTRACT:
An eye refractive power measurement apparatus for measuring a refractive power of an eye to be examined, the apparatus comprising a projecting optical system for scanning and projecting a slit light bundle onto a fundus of the eye to be examined, a photo-receiving optical system provided with a photo-detector arranged at a conjugate position with a cornea of the eye so as to have a predetermined position with respect to a scanning direction of the slit light bundle and an open diaphragm, can be arranged at different predetermined positions, for reducing the slit light bundle, a selecting device for selecting the position of the open diaphragm so as to change a range in which the photo-receiving optical system can detect an eye refractive power and an eye refractive power calculating device to calculate a refractive power of the eye based on an output signal from the photo-detector receiving the slit light bundle reflected from the fundus of the eye through the open diaphragm and the position of the open diaphragm.
REFERENCES:
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European Search Report dated Jan. 29, 1998 (2 pages).
Manuel George
Nidek Co. Ltd.
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