| 摘要 |
A closed-loop control system for the superficial photoablation of stromal tissue from an exposed surface includes an active mirror for directing a diagnostic laser beam through the exposed surface to a focal point on the retina of an eye. The reflected beam is analyzed by a detector to identify a distorted wavefront that is indicative of required corrections, and an induced wavefront that is indicative of optical aberrations that have been mechanically introduced when the stromal tissue was exposed. A compensator alters a desired wavefront with the induced wavefront to create a rectified wavefront. A comparator then compares the rectified wavefront with the distorted wavefront to create an error signal. In the operation of the closed-loop control system, the error signal is used to maintain a focal point on the retina for the diagnostic laser beam. Also, at a null, the error signal indicates when the required amount of stromal tissue has been photoablated.
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