Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-02-20
1998-07-07
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 310
Patent
active
057777187
ABSTRACT:
An eye refractometer has two to three visual target systems provided for right and left eyes. Each of the visual target systems has a visual target and diopter varying device for making the visual target variable in diopter relative to an eye to be examined. An optical path coupler is provided between the eye to be examined and the diopter varying device with respect to at least one of the visual target systems. An eye refractive power measuring device is also provided for projecting light from outside of the visual target systems through the optical path coupling device and receiving the light from the eye to be examined to thereby measure the refractive power of the eye to be examined. Also included is a switchover device for switching the eye refractive power measuring device from measuring the refractive power of one eye to measuring the refractive power of the other eye by moving the refractive power measuring device left or right.
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Canon Kabushiki Kaisha
Mai Huy
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