The present invention relates to a planning device for determining control data for a treatment device (1) enabling surgical tattooing of the cornea (22) of an eye (3) of a patient, a corresponding treatment device (1), and a method for preparing and generating control data and data concerning surgical tattooing of the cornea (22) of an eye (3). The aim of the invention is to describe the devices and methods for preparing and carrying out corneal tattooing to provide an artificial iris which makes it possible, in a cosmetic sense, to provide an artificial iris which can barely be distinguished from a natural iris and, in a medical sense, an artificial iris which fulfils as many functions of a natural iris as possible with little secondary effort in the cornea (22). This aim is achieved using the corresponding devices and methods which, based on the measurement data and functional data introduced, define a substantially annular surface (32) which is located inside the cornea (22) and which is delimited by a circular internal edge (15) with an interior diameter and by a circular external edge (16) with an exterior diameter, wherein the annular surface (32) has a distance and an incline with regard to the surface of the cornea (23), and for this annular surface (32), a set of control data for controlling the laser device (L) is generated which defines a pattern of target points (6) in the cornea (22) with perforation zones (4) partially or completely intersecting, wherein upon application of the pulsed laser beam (2), the tissue of the cornea is cut and the external edge (16) of the annular surface (32) has a constant distance relative to the external edge of the iris (14).La présente invention concerne un dispositif de planification pour la détermination de données de commande pour un dispositif de traitement (1) permettant le tatouage opératoire de la cornée (22) d'un œil (3) d'un patient, un dispositif de traitement (1) correspondant, ainsi qu'un procédé de préparat
