Device and method for determining a pupil position

An optical device for determining a pupil position of an eye, the optical device comprising:

• a laser;
• a first photodetector;
• a second photodetector;
• an adjustable beam deflection device;
• and
• a control unit configured to control the adjustable beam deflection device;
• wherein the optical device is designed configured to:
• guide light generated by the laser at least partially as illumination light via an illumination beam path to the beam deflection device, and illuminate a plurality of illumination points on the eye and an eye environment of the eye using the illumination light by adjusting the beam deflection device using the control unit,
• measure, during illumination of at least a first portion of the illumination points using the first photodetector, a laser power of the laser when illuminating the illumination points and/or detect, using the first photodetector, the illumination light reflected at a boundary surface of the eye or the eye environment and entering the illumination beam path via the beam deflection device, and
• detect, during illumination of at least a second portion of the illumination points, illumination light scattered on the eye or on the eye environment, using the second photodetector.

A method for determining a pupil position of an eye using an optical device, wherein the optical device includes a laser, a first photodetector, a second photodetector, an adjustable beam deflection device, a control unit configured to control the adjustable beam deflection device, and an evaluation unit, and the eye has a pupil and a retina, the method comprising the following steps:

• a) generating light by the laser and at least partially guiding the light as illumination light via an illumination beam path to the beam deflection device;
• b) illuminating a plurality of illumination points on the eye and an eye environment of the eye by the illumination light by adjusting the beam deflection device using the control unit, wherein the beam deflection device assumes different positions for different illumination points, and, for a first portion of the illumination points, the illumination light is reflected back to the beam deflection device at the retina of the eye, and, for a second portion of the illumination points, the illumination light is scattered on at least one reference marker of the eye environment;
• c) when illuminating at least the first portion of the illumination points:
• (i) measuring a laser power of the laser using the first photodetector, and/or (ii) detecting illumination light reflected at a boundary surface of the eye or the eye environment with the first photodetector, and evaluating signals from the first photodetector by the evaluation unit, including an assignment of the signals to a position of the beam deflection device;
• d) when illuminating at least the second portion of the illumination points, detecting illumination light scattered on the eye or at the eye environment with the second photodetector and evaluating signals from the second photodetector by the evaluation unit, including an assignment of the signals to a position of the beam deflection device;
• e) determining a position of the at least one reference marker based on the evaluated signals from the second photodetector by the evaluation unit;
• and
• f) determining, taking into account the position of the at least one reference marker, the pupil position based on the evaluated signals from the first photodetector by the evaluation unit.

Smart glasses, comprising:

• an optical device for determining a pupil position of an eye, the optical device including:
• a laser,
• a first photodetector,
• a second photodetector,
• an adjustable beam deflection device, and
• a control unit configured to control the adjustable beam deflection device,
• wherein the optical device is designed configured to:
• guide light generated by the laser at least partially as illumination light via an illumination beam path to the beam deflection device, and illuminate a plurality of illumination points on the eye and an eye environment of the eye using the illumination light by adjusting the beam deflection device using the control unit,
• measure, during illumination of at least a first portion of the illumination points using the first photodetector, a laser power of the laser when illuminating the illumination points and/or detect, using the first photodetector, the illumination light reflected at a boundary surface of the eye or the eye environment and entering the illumination beam path via the beam deflection device, and
• detect, during illumination of at least a second portion of the illumination points, illumination light scattered on the eye or on the eye environment, using the second photodetector.