Device for laser ablation of a human cornea, with - a source of Excimer laser beam (20) that radiates in the UV wavelength range for the emission of a focused treatment laser beam (20 '), - a device of coherence optical interferometric measurement (34) for measuring the distance of a predetermined measuring point or a measuring area of an eye to be treated (10) with respect to a reference point (44) related in a known manner with the focus position of the treatment laser beam, and - an evaluation and control unit (C) designed to detect, based on the distance measurement data of the measuring device, the coincidence or divergence of a desired place of action of the laser treatment beam in or inside the eye and the focus position of the laser treatment beam, and to cause, in case of a divergence, an indication of a need for adjustment in an indication unit (50), found the desired place of action being located in a known relative z position with respect to the predetermined measurement point or the measurement zone, z defining the direction of propagation of the treatment laser beam and indicating the need for indicated adjustment of the direction and measurement of vertical displacement necessary of the patient.Dispositivo para la ablación con láser de una córnea humana, con - una fuente de rayo láser Excimer (20) que irradia en la gama de longitud de onda UV para la emisión de un rayo láser de tratamiento enfocado (20'), - un dispositivo de medición interferométrico óptico de coherencia (34) para la medición de la distancia de un punto de medición predeterminado o de una zona de medición de un ojo a tratar (10) respecto a un punto de referencia (44) relacionado de manera conocida con la posición del foco del rayo láser de tratamiento, y - una unidad de evaluación y de control (C) concebida para detectar, en base a los datos de medición de distancia del dispositivo de medición, la coincidencia o divergencia de un lugar de actuación deseado del rayo láser de tratamient
