A method for providing control data for an ophthalmological laser of a treatment apparatus for treating a human or animal eye, wherein the method comprises the following steps performed by a control device:
- setting an area to be irradiated on or in a cornea of the eye to be treated for performing an irradiation treatment with the laser,
- setting a virtual irradiation mask in a mask plane,
- wherein the area to be irradiated is situated within the virtual irradiation mask in a perpendicular projection onto the mask plane, and
- providing control data for the laser by the control device, wherein the control data includes coordinates of the area to be irradiated, such that the laser emits laser pulses to the area to be irradiated during the treatment.