Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1999-03-02
1999-11-23
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
A61B 310
Patent
active
059888148
ABSTRACT:
A patient-interactive method and apparatus for measuring eye refraction includes a display for producing, alternately, two spaced-apart light spots, and an aperture device for passing light from one spot through an aperture in one position, to travel to the eye, and for passing light from the other spot through an aperture in a second position, to travel to the eye. If the patient sees a single spot, the eye is properly refracting, but if he/she sees two spots, the eye is not properly refracting. Apparatus is provided to allow the patient to adjust the spacing of the light spots, and thus the angle that light enters the eye, until the patient views a single light spot. The amount of adjustment of the spacing of light spots is measured to thereby provide a measure of diopter correction necessary to correct the refraction error.
REFERENCES:
patent: 4730917 (1988-03-01), Krueger
patent: 4938584 (1990-07-01), Suematsu et al.
patent: 5011276 (1991-04-01), Iwamoto
patent: 5016643 (1991-05-01), Applegate
patent: 5360010 (1994-11-01), Applegate
Erickson Bruce E.
Rohlfing Thomas R.
Evans & Sutherland Computer Corporation
Manuel George
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