Patent ID: 8235973
Filing Date: 2012-08-07
Classification: A61F

Abstract:
1. A method of laser surgery on an eye, the method comprising: providing a source of pulsed femtosecond laser radiation, a plurality of lenses arranged in succession in the beam path of the laser radiation, of which at least one is arranged so as to be adjustable relative to other lenses in the direction of the beam path, and an actuator for adjusting the at least one adjustable lens; measuring a surface topography of a surface of the eye using a measuring arrangement, wherein the measuring arrangement utilizes optical coherence tomography to measure the surface topography of the surface of the eye; monitoring a position of the eye relative to the source of pulsed femtosecond laser radiation using the measuring arrangement, wherein the measuring arrangement utilizes optical coherence tomography to monitor the position of the eye relative to the source of pulsed femtosecond laser radiation during an operation on the eye, and wherein the measuring arrangement is configured to determine the current position of the eye relative to the focusing optics during the operation by monitoring a z-position of a reference point on the surface topography of the surface of the eye using optical coherence tomography, wherein the measuring arrangement is configured to communicate data representative of the current position of the eye directly to a control unit configured to control the actuator; and controlling, with the control unit, the actuator to move the adjustable lens based on the measured surface topography of the eye obtained in said measuring step using optical coherence tomography and based on the position of the eye as determined in the monitoring step using optical coherence tomography to control a focus depth of the source of pulsed femtosecond laser radiation relative to the surface of the eye.