Method for a pupil detection and/or pupil tracking, optical system and smart glasses
A method for a pupil detection and/or pupil tracking with the aid of an evaluation of a speckle pattern back-reflected by an eye of a light of an infrared laser irradiated into the eye. At least the light of the infrared laser irradiated into the eye is scanned via a holographic optical element that includes different refractive structures, the different refractive structures being configured in such a way that they each generate a different visual defect correction.
1. A method for a pupil detection and/or pupil tracking using an evaluation of a speckle pattern back-reflected by an eye of a light of an infrared laser irradiated into the eye, the method comprising:
scanning at least the light of the infrared laser into the eye via a holographic optical element (HOE) that includes different refractive structures, the different refractive structures being configured in such a way that each generates a different visual defect correction; and
evaluating the speckle pattern back-reflected by the eye of the light of the infrared laser scanned into the eye.
2. The method as recited in claim 1 , wherein the different refractive structures are configured in such a way that respectively different focal points are generated in the eye for the light of the infrared laser irradiated into the eye.
3. The method as recited in claim 1 , wherein a visual defect of the eye is ascertained using an analysis of a beam path of the speckle pattern back-reflected by the eye.
4. The method as recited in claim 1 , wherein a development of a visual defect of the eye is ascertained using an analysis of a temporal change of a beam path of the speckle pattern back-reflected by the eye.
5. An optical system, comprising:
a laser projector configured to at least generate a scanned infrared laser beam; and
a holographic optical element (HOE) that includes different refractive structures;
wherein the optical system is configured scan at least the laser beam of the infrared laser into an eye via the HOE, wherein the different refractive structures are configured in such a way that each generates a different visual defect correction.
6. The optical system as recited in claim 5 , wherein the HOE has a segmented configuration, at least two different segments of the HOE including different refractive structures for different visual defect corrections.
7. The optical system as recited in claim 5 , wherein the different refractive structures are situated in the HOE in a linear manner or in a regular pattern made up of rhombuses, or triangles or other shapes.
8. The optical system as recited in claim 7 , wherein lines or pattern fields of the HOE that include the different refractive structures have a sufficiently large spatial extension which allows for a mapping of a back-reflected speckle pattern for ascertaining a respectively optimal refractive structure.
9. The optical system as recited in claim 7 , wherein lines or pattern fields of the HOE that include the different refractive structures have a spatial extension which is smaller than that required for a mapping of a back-reflected speckle pattern.
10. The optical system as recited in claim 5 , further comprising:
an infrared detector configured to detect a reflection of the infrared laser beam back-reflected by a retina of the eye, opposite a laser emitting direction of the infrared laser beam.
11. Smart glasses configured for a pupil detection and/or pupil tracking using an evaluation of a speckle pattern back-reflected by an eye of a light of an infrared laser irradiated into the eye, the smart glasses configured to:
scan at least the light of the infrared laser into the eye via a holographic optical element (HOE) that includes different refractive structures, the different refractive structures being configured in such a way that each generates a different visual defect correction; and
evaluate the speckle pattern back-reflected by the eye of the light of the infrared laser scanned into the eye.