Height reconstruction from axial distance data using an ellipse arc-step method
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United States of America Patent
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Issued Date -
Jan 30, 2003
app pub date -
Jul 30, 2002
filing date -
Jul 30, 2001
priority date (Note) -
Abandoned
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Abstract
A method is provided of reconstructing the height data from the radial distance data gathered by a corneal measurement device such as a corneal topographer or videokeratometer. The present invention performs the height reconstruction using an algorithm that is more accurate than the prior art. The prior art uses the circle arc-step or midpoint height reconstruction algorithms, while the present invention teaches the ellipse arc-step height reconstruction. This is important because it is now known that the eye surface is better modeled with an ellipsoid approximation than a spherical approximation.
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