| 主权项 |
1. A diagnostic device for detecting a layer boundary in an eye, comprising:
a light source, wherein the light source defines an object plane, a sensor unit, a beam path which is designed to guide at least one measuring beam of the light source from the object plane of the light source into an intersecting region of the measuring beam with an optical axis in the eye, an actuator comprising a 2D scanning mirror designed to move the intersecting region along the optical axis, the beam path is designed such that, in a detection state, the measuring beam is guided from a layer boundary as a bounced-back measuring beam into the sensor unit if the intersecting region is located on the layer boundary and, in the detection state, the measuring beam is guided back to the center unit on a different beam path at least between the eye and a last optical element, and an evaluation unit which is designed to recognize the detection state on the basis of the signals of the sensor unit, the evaluation unit is designed to estimate and/or determine a layer thickness between a first and a second layer boundary on the basis of the position of the actuator in a detection state of the first and the second layer boundary, the measuring beam being guided as an unexpanded, single measuring beam through the beam path, wherein the measuring beam has a diameter (FWHM) that is always less than 2 mm between the last optical element and the eye, and the actuator moves a lateral position of the measuring beam in the eye to move the intersecting region along the optical axis, wherein the measuring beam scans the eye in the depth direction along the optical axis by way of the 2D scanning mirror and the bounced-back measuring beam scans laterally to reach the detection state by way of the 2D scanning mirror, the 2D scanning mirror reflecting the bounced-back measuring beam onto the sensor unit in the detection state, and wherein the last optical element that guides the measuring beam onto the intersecting region is designed as one of a diffractive optical element, a diffractive element, a reflection element, and a refractive element, and the last optical element is a ring element having a plurality of regions in the direction of rotation, pairs of said regions being assigned to a layer boundary in the eye such that, in the detection state, the measuring laser beam is guided by one region of one of the pairs of said regions to the eye and guided back via the other region of the one of the pairs of said regions, and the beam path is designed to send accommodation beams through a central opening of the ring element for forming an accommodation target. |
