Control data generation for the eye surgical treatment of defective vision

A device for generating control data, which are adapted to control a laser device emitting laser radiation for surgically correcting optical imaging errors of an eye, the device being operably coupled to the laser device emitting laser radiation and in control thereof comprising:

• an interface for receiving correction data specifying the optical imaging errors;
• and
• a calculation device configured to define at least one three dimensional cutting surface in a cornea of the eye;
• the calculation device being configured to specify the three dimensional cutting surface adapted to isolate a volume within a cornea of the eye by application of laser radiation applied from the laser device for correcting the optical imaging errors by removal of the volume from the cornea;
• the calculation device further being configured to make the three dimensional cutting surface angularly symmetrical with respect to rotation around an optical axis of the eye;
• the calculation device being configured to define at least one path curve, along which a focus of the laser radiation is to be shifted, which path curve lies in the cutting surface or within a tolerance zone around the cutting surface;
• and
• the calculation device being configured to specify a depth position controlled by operation of a z-scanner for the at least one path curve;
• wherein the depth position is based on a contour function and controlled by operation of the z-scanner, has a periodicity and is dependent on a rotational angle around the optical axis of the eye and is substantially periodically varying in the rotational angle, and
• wherein the calculation device is configured to generate the control data such that the control data control the laser device to move a position of the focus of the laser radiation along the at least one path curve in concentric curves or a spiral revolving the focus position around the optical axis of the eye when viewed in a projection along a direction of incidence of the laser radiation.

A non-transitory computer readable data storage medium that is not a carrier wave or signal, comprising instructions that cause a computer to generate control data, which are adapted to control a laser device emitting laser radiation for surgically correcting optical imaging errors of an eye, the instructions comprising:

• specifying at least one three dimensional cutting surface adapted to isolate a volume within a cornea of the eye by application of laser radiation applied from the laser device for correcting the optical imaging errors by removal of the volume from the cornea;
• making the three dimensional cutting surface angularly symmetrical with respect to rotation around an optical axis of the eye;
• defining at least one path curve, along which a focus of the laser radiation is to be shifted, which path curve lies in the cutting surface or within a tolerance zone around the cutting surface;
• specifying a depth position controlled by operation of a z-scanner for the at least one path curve, wherein the depth position based on a contour function is controlled by operation of the z-scanner and is dependent on a rotational angle around the optical axis of the eye and has a periodicity substantially periodically varying in the rotational angle;
• and
• generating the control data such that the control data control the laser device to move a focus position of the focus of the laser radiation along the at least one path curve in concentric curves or a spiral revolving the focus position around the optical axis of the eye when viewed in a projection along a direction of incidence of the laser radiation.