Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1994-06-27
1997-11-04
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, 351246, A61B 314, A61B 310, A61B 300
Patent
active
056845618
ABSTRACT:
An autorefractor utilizes two light emitters and corresponding optics to project images onto the fundus, with the focus of these images bracketing the gross sphere of an emmetrope. A single detector generates a signal corresponding to each emitter. In an alternate embodiment, a single emitter and two detectors having foci bracketing the gross sphere of an emmetrope generate a signal corresponding to each detector. The light reflected from the fundus is detected and the differential intensities of two signals are used to determine departure in refraction from 0 diopter sphere. Multi-segmented or CCD detectors may be used to measure cylinder/axis, determine length and direction of gaze (in combination with a Purkinje image sensor) and to generate and analyze retinal images.
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Daphne Eye Technologies
Mai Huy
LandOfFree
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