Wavefront sensing with ellipsoidal lensing structure
AssigneeFacebook Technologies, LLC
InventorsRobin Sharma, Andrew John Ouderkirk
Life of this patent
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Abstract
An eye is illuminated with infrared illumination light. Illuminating the eye includes illuminating an ellipsoidal lensing structure with the infrared illumination light. A wavefront image of the reflected infrared light is generated. The reflected infrared light is the infrared illumination light reflected by a retina and exiting a pupil of the eye. The ellipsoidal lensing structure redirects the reflected infrared light to a wavefront sensor that generates the wavefront image. An accommodative eye state value is generated based at least in part on the wavefront image.
Claims20
A method comprising:
- illuminating an eyebox area with infrared illumination light propagating substantially normal to a pupil plane of an eye, wherein illuminating the eyebox area includes illuminating an ellipsoidal combiner with the infrared illumination light, wherein the ellipsoidal combiner is configured to reflect the infrared illumination light to a first foci located at a center of rotation of the eye, and wherein the ellipsoidal combiner is configured to pass visible light;
- generating a wavefront image of reflected infrared light, wherein the reflected infrared light is the infrared illumination light reflected by a retina and exiting a pupil of the eye, and wherein the ellipsoidal combiner reflects the reflected infrared light to a wavefront sensor that generates the wavefront image;
- and
- determining an accommodative eye state value based at least in part on the wavefront image.
A near-eye optical system comprising:
- an infrared light source configured to emit infrared illumination light;
- an ellipsoidal combiner configured to reflect the infrared illumination light to an eyebox area, the ellipsoidal combiner including an ellipsoidal lensing structure having a first foci and a second foci, wherein the ellipsoidal combiner is configured to be positioned near an eyebox area where the first foci of the ellipsoidal lensing structure would be located approximately at a center of rotation of an eye placed in the eyebox area, and wherein the ellipsoidal combiner is configured to pass visible light;
- a beam-steering element configured to selectively redirect the infrared illumination light to the ellipsoidal combiner;
- a wavefront sensor;
- and
- a beam splitter configured to receive infrared retina reflected light from the ellipsoidal combiner and to redirect a portion of the infrared retina reflected light to the wavefront sensor, wherein the infrared illumination light emitted by the infrared light source propagates through the beam splitter prior to being reflected to the eyebox area by the ellipsoidal combiner.
A Head Mounted Display (HMD) comprising:
- an infrared light source configured to emit infrared illumination light;
- an ellipsoidal combiner configured to reflect the infrared illumination light to an eyebox area, the ellipsoidal combiner including an ellipsoidal lensing structure having a first foci and a second foci, wherein the ellipsoidal combiner is configured to be positioned near an eyebox area where the first foci of the ellipsoidal lensing structure would be located at approximately a center of rotation of an eye placed in the eyebox area, and wherein the ellipsoidal combiner is configured to pass visible light;
- and
- a wavefront sensor configured to receive infrared retina reflected light from the ellipsoidal combiner, wherein the infrared retina reflected light is the infrared illumination light reflected by a retina and exiting a pupil of the eye placed in the eyebox area, and wherein the ellipsoidal combiner reflects the infrared retina reflected light to the wavefront sensor.
Dependencies are inferred from the claim text.