LASER EYE SURGERY SYSTEM USING WAVEFRONT SENSOR ANALYSIS TO CONTROL DIGITAL MICROMIRROR DEVICE (DMD) MIRROR PATTERNS

摘要

A system (10) and method for performing corneal ablation or reshaping with alaser (22) in order to correct aberrations in the optical system of the eye(40) utilizes a wavefront sensor which defines a wavefront correction for theeye (40) and then, based upon that defined wavefront correction, drives adigital micromirror device (DMD) which modulates a laser beam to the eye (40)to perform the correction. As the DMD (26) is a 2-D array of individuallycontrolled mirrors, and the wavefront sensor analysis can provide a sequenceof two dimensional arrays of values which together define the wavefrontcorrection for the eye (40), the combination of the two produces a method forcorrecting the corneal surface. The system (10) may be operated in either oftwo manners to achieve optimum refractive corrections: (1) off-linemeasurement of the eye optical system via the wavefront sensor followed by DMD-based laser refractive surgery, or (2) realtime measurement of the eye opticalsystem via the wavefront sensor which directs a DMD-based laser refractivesurgery system.