Ellipsoidal corneal modeling for estimation and reshaping
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United States of America Patent
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Jan 14, 2003
Grant Date -
N/A
app pub date -
Oct 5, 2000
filing date -
Oct 5, 1999
priority date (Note) -
Expired
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Abstract
The present invention provides apparatus and techniques for performing prolate shaped corneal reshaping using an ellipsoid corneal modeler. In accordance with the principles of the present invention, an ellipsoid corneal modeler is implemented with the well behaved conicoid, combined with a modeled surface which can be used for astigmatic treatments. An ellipsoid corneal modeler includes an ellipsoid fitter which utilizes two radii of curvature, asphericity (Q), and a surface rotation about the pupil center (roation of .theta.), yielding the equation: ##EQU1## Moreover, in accordance with the principles of the present invention, a target ellipsoid corneal surface with the applied refraction can be used to determine the required tissue removal for the given refractive change. This final shape will maintain the asphericity of the original corneal surface and therefore limit the spherical aberrations induced by the use of otherwise conventional techniques.
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