Patent ID: 8632527

Claim:
A computer implemented method of generating control data for an eye-surgery treatment apparatus that, by application of a laser device, separates tissue layers in a cornea of an eye, wherein, during operation of the laser device, a contact glass having a contact surface is pressed against the cornea and deforms the cornea to conform to a shape of the contact surface, the method comprising: generating the control data for the laser device such that the control data specifies target point coordinates for the laser device that are located in the cornea and, taking into account, in the generation of the target-point coordinates, the deformation of the cornea, caused by the contact glass, that exists during the operation of the laser device, wherein the taking into account the deformation of the cornea comprises execution of the following to determine a displacement of a point P in the non-deformed cornea, the displacement being caused by deformation: determining, on a reference surface of the non-deformed cornea, in relation to the point P, a point O that is located such that a surface normal running through the point O goes through the point P, the reference surface being either the anterior surface of the cornea or a surface obtained through radial contraction of the anterior surface by a bend line displacement L, determining a distance SO between a vertex S of the reference surface and the point O, the distance SO being the arc length on the reference surface, determining on a contact-glass reference surface a point O′ that is located at the distance SO from a contact-surface vertex, the contact-glass reference surface being either the contact surface of the contact glass or a surface obtained through radial contraction of the contact surface by the bend line displacement L and/or by a thickness F′ of a fluid film on the cornea, determining, on a surface normal through the point O′, a point P′ that has the same distance from O′ as the point P has from the point O, and using the point P′ as a point P displaced by the deformation; and/or wherein the taking into account the deformation of the cornea comprises execution of the following to determine a displacement of a point Q′ in the deformed cornea, the displacement being caused by relaxation: determining on the contact-glass reference surface, in relation to the point Q′, a point O′ that is located such that a surface normal running through the point O′ goes through the point Q′, determining a distance SO′ between the vertex S and the point O′, the distance SO′ being the arc length on the contact-glass reference surface, determining, on the reference surface, a point O that is located at the distance SO′ from the vertex S, determining, on a surface normal through the point O, a point Q that has the same distance from O as the point Q′ has from the point O′, and using the point Q as a point Q′ displaced by the relaxation.