A planning device for generating control data for a treatment apparatus for cornea transplantation, said apparatus is configured for using a laser device to separate, by at least one cut surface (20, 23) in the cornea, a corneal volume, which corneal volume is to be removed from surrounding cornea, and to separate, by at least one cut surface in a transplantation material, a transplant from the surrounding transplantation material, which transplant is to be inserted into the cornea, wherein the planning device comprises: - an interface for supplying measurement data relating to parameters of the cornea, and - computing means configured for defining a corneal cut surface (22, 23) on the basis of the measurement data, which corneal cut surface (22, 23) confines the corneal volume to be removed, wherein this corneal volume is located within the cornea and below a front face of the cornea, - wherein said computing means are further configured - to determine a transplant cut surface, which transplant cut surface depends on the defined corneal cut surface (22, 23) and confines the transplant, and - to generate control data sets for the corneal cut surface (22, 23) and the transplant cut surface to control the laser device, wherein the respective cut surfaces can be produced by the laser device when using the control data sets, so as to isolate the corneal volume and the transplant from the surrounding cornea and transplantation material respectively and to make them removable, as well as to make the transplant transplantable, - wherein the computing means, when determining the transplant cut surface, are further configured to cause a geometrical deviation between the corneal volume and the transplant, which deviation depends on a predetermined change in refraction, so as to achieve not only a replacement of tissue by said transplantation but also a selective refractive effect in order to correct eyesight defects. - an interface for supplying measurement data relating to parameters of the cornea, and - computing means configured for defining a corneal cut surface (22, 23) on the basis of the measurement data, which corneal cut surface (22, 23) confines the corneal volume to be removed, wherein this corneal volume is located within the cornea and below a front face of the cornea, - wherein said computing means are further configured - to determine a transplant cut surface, which transplant cut surface depends on the defined corneal cut surface (22, 23) and confines the transplant, and - to generate control data sets for the corneal cut surface (22, 23) and the transplant cut surface to control the laser device, wherein the respective cut surfaces can be produced by the laser device when using the control data sets, so as to isolate the corneal volume and the transplant from the surrounding cornea and transplantation material respectively and to make them removable, as well as to make the transplant transplantable, - to determine a transplant cut surface, which transplant cut surface depends on the defined corneal cut surface (22, 23) and confines the transplant, and - to generate control data sets for the corneal cut surface (22, 23) and the transplant cut surface to control the laser device, wherein the respective cut surfaces can be produced by the laser device when using the control data sets, so as to isolate the corneal volume and the transplant from the surrounding cornea and transplantation material respectively and to make them removable, as well as to make the transplant transplantable, - wherein the computing means, when determining the transplant cut surface, are further configured to cause a geometrical deviation between the corneal volume and the transplant, which deviation depends on a predetermined change in refraction, so as to achieve not only a replacement of tissue by said transplantation but also a selective refractive effect in order to correct eyesight defects.