Keratometric to apical radius conversion
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United States of America Patent
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Issued Date -
Aug 22, 2002
app pub date -
Jan 18, 2002
filing date -
Oct 5, 1999
priority date (Note) -
Abandoned
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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: 1 x 2 R x + y 2 R y + z z ( 2 R xR y ( 1 + Q )R x + R y)= 2 R xR y ( 1 + Q )R x + R y ( 5 ) Moreover, a conversion is provided to convert between measurements obtained by a keratometer, and apical radii. In a further embodiment provided by the present invention, conversion is made possible between radii measurements obtained clinically (e.g., using a keratometer) and radii measurements at the apex, i.e., keratometric to apical radius conversion.
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