Method for the ablation of a three-dimensional surface by means of an ablation device, the device comprising: - a laser source for generating a pulsed laser beam; - an optical module for focusing and aiming, along axes defining a plane (X, Y) and along a depth (z), the beam on the surface to be ablated; - at least one camera for observing the surface to be ablated; and - a control connected to the module and to the camera; the method being characterised in that it comprises - a step for calibrating the device wherein - the module illuminates (S1, S2') along said axes (X, Y) a calibration plate, located at a depth (z), to illuminate a plurality of defined points of the calibration plate, while the camera observes said calibration plate, the control determining a correspondence between, on one hand, the illumination position (sx) of each of the illuminated points of the calibration plate at the depth (z) and, on the other, the position (px) observed by the camera of the illuminated points; the calibration plate being successively positioned at a plurality of depths (z) during the calibration step, to enable a plurality of illuminations by the module, observations by the camera and determinations of correspondences by the control; the control determines a relationship between the correspondences. - a step for determining the three-dimensional shape of the surface to be ablated, on the basis of the calibration step, by triangulation, and - a step for the ablation of the three-dimensional surface, whereby the control controls the module on the basis of the determined shape of the surface, to focus and aim, along axes defining a plane (X, Y) and along a depth (z), the beam on the surface to be ablated. - a laser source for generating a pulsed laser beam; - an optical module for focusing and aiming, along axes defining a plane (X, Y) and along a depth (z), the beam on the surface to be ablated; - at least one camera for observing the surface to be ablated; and - a control connected to the module and to the camera; - a step for calibrating the device wherein - the module illuminates (S1, S2') along said axes (X, Y) a calibration plate, located at a depth (z), to illuminate a plurality of defined points of the calibration plate, while the camera observes said calibration plate, the control determining a correspondence between, on one hand, the illumination position (sx) of each of the illuminated points of the calibration plate at the depth (z) and, on the other, the position (px) observed by the camera of the illuminated points; the calibration plate being successively positioned at a plurality of depths (z) during the calibration step, to enable a plurality of illuminations by the module, observations by the camera and determinations of correspondences by the control; the control determines a relationship between the correspondences. - the module illuminates (S1, S2') along said axes (X, Y) a calibration plate, located at a depth (z), to illuminate a plurality of defined points of the calibration plate, while the camera observes said calibration plate, the control determining a correspondence between, on one hand, the illumination position (sx) of each of the illuminated points of the calibration plate at the depth (z) and, on the other, the position (px) observed by the camera of the illuminated points; - a step for determining the three-dimensional shape of the surface to be ablated, on the basis of the calibration step, by triangulation, and - a step for the ablation of the three-dimensional surface, whereby the control controls the module on the basis of the determined shape of the surface, to focus and aim, along axes defining a plane (X, Y) and along a depth (z), the beam on the surface to be ablated.