Eye registration and astigmatism alignment control systems and method
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United States of America Patent
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Mar 9, 2004
Grant Date -
Jan 31, 2002
app pub date -
Apr 19, 2001
filing date -
Apr 19, 2000
priority date (Note) -
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Abstract
An orientation system for corrective eye surgery includes a camera for performing a first image mapping a patient's eye using a predetermined eye feature and software for processing the first image map to determine an edge location of the feature. A second image mapping is performed with the patient in a different position. The second image map is processed to locate the feature. In a second embodiment a pen is used to make two alignment marks on the eye. The eye is imaged with the patient in another position, and the image displayed. Software superimposes a graphical reticle onto the eye image, which is movable to align with the two alignment marks. In both cases software also calculates an orientational change to be applied to a corrective prescription for a surgical procedure to be performed on the eye with the patient in the second position.
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