Design of a soft contact lens based upon novel methods of corneal topographic analysis
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United States of America Patent
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Jan 28, 2003
Grant Date -
N/A
app pub date -
Aug 11, 1999
filing date -
Aug 11, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided which is used to design soft contact lens via corneal topographic analysis. The topography of the cornea is matched to a corresponding topography of a soft contact lens. A geometrical transformation which maps the corneal elevation onto the back surface of an unflexed soft contact lens is used to minimize errors induced by flexure of the lens. The mapping transformation takes into account the effects of flexure. As a result, the contact lens has a back surface with a curvature which matches the specific elevations of the cornea, while the front surface can be spherical or any desired symmetrical or asymmetrical shape.
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