Positioning device, light processor having such a positioning device, and method for laser eye surgery using such a light processor

A method for treating cataract or a refraction-based visual impairment, the method comprising:

• adjusting a positioning device having two rotation drives having different diameters, and an object receiver for receiving an object, where said object receiver is coupled to a first of said two rotation drives and said first of said two rotation drives is coupled to a second of said two rotation drives, so that said object receiver is configured to be rotated about axes of rotation of both rotation drives, that are arranged parallel and offset from one another, and is adjustable in said positioning plane, wherein said first rotation drive and/or said second rotation drive is/are ring-shaped, wherein each ring-shaped rotation drive includes two rings rotatable relative to one another, one of which is formed as a stator ring and another of which is formed as a rotor ring, and wherein said first rotation drive and/or said second rotation drive is/are configured as a piezoelectric rotation drive;
• arranging a light-directing element on said object receiver of said positioning device and adjusting the light-directing element in said positioning plane by way of said positioning device in order to direct a light beam onto an object to be processed by said light beam;
• and
• acting on the cornea of a patient by way of said light beam in the form of a laser beam.

A method for laser eye surgery using a light processor including a positioning device for positioning an object in a positioning plane, the positioning device including two rotation drives having different diameters and an object receiver for receiving an object, where said object receiver is coupled to a first of said two rotation drives, and said first of said two rotation drives is coupled to a second of said two rotation drives, so that said object receiver is configured to be rotated about axes of rotation of both rotation drives that are arranged parallel and offset from one another, and is adjustable in said positioning plane, wherein said first rotation drive and/or said second rotation drive is/are ring-shaped, wherein each ring-shaped rotation drive includes two rings rotatable relative to one another, one of which is formed as a stator ring and another of which is formed as a rotor ring, and wherein said first rotation drive and/or said second rotation drive is/are configured as a piezoelectric rotation drive, the light processor including a light-directing element which is arranged on said object receiver of said positioning device and configured to be adjustable in said positioning plane by way of said positioning device in order to direct a light beam onto an object to be processed by said light beam, the method comprising:

• a. arranging said light processor at a distance from a cornea of a patient, such that a positioning plane of the positioning device is aligned exactly or substantially perpendicular to a normal to said cornea of the patient;
• and
• b. adjusting the light-directing element arranged in the object receiver of said positioning device in the positioning plane by way of the first rotation drive and/or a second rotation drive so that the light beam directed by said light-directing element travels a track that is circular at least in sections and/or arcuate at least in section and/or or a track that is straight at least in sections on said cornea of the patient for changing a corneal curvature of the patient.