Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-06-16
1998-12-01
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, A61B 314, A61B 310
Patent
active
058446591
ABSTRACT:
An ophthalmic apparatus for measuring a refractive power of an eye to be examined, the ophthalmic apparatus providing an alignment detecting device for detecting an alignment condition of the apparatus corresponding to the eye to be examined by projecting a light so as to form a target onto the eye to be examined and detecting the target, a first judging device for judging whether the alignment condition of up-down/left-right directions is within a predetermined allowable condition based on the detected result of the alignment detecting device, a refractive power temporary measuring device for measuring a temporary refractive power value of the eye to be examined by generating a measurement start signal when it is judged by the first judging device that the alignment condition of up-down/ left-right directions is within the predetermined allowable condition, variable means for varying an allowable condition of working distance based on a measured result of the refractive power temporary measuring device, and a second judging device for judging whether the eye to be examined is arranged within the allowable condition of working distance set by the variable device based on the detected result of the alignment detecting device.
REFERENCES:
patent: 5406076 (1995-04-01), Mimura et al.
patent: 5463430 (1995-10-01), Isogai et al.
patent: 5625428 (1997-04-01), Isogai
Dang Hung X.
Nidek Co. Ltd.
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