Contact lens for keratoconus
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United States of America Patent
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Dec 27, 2011
Grant Date -
May 27, 2010
app pub date -
Nov 26, 2008
filing date -
Nov 26, 2008
priority date (Note) -
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Abstract
The present invention is directed to a non-deforming contact lens for keratoconus patients comprising a central zone having a displaced central zone. In particular, the central zone is displaced from the geometric center of the lens. The shape of the central zone is egg or spoon-shaped and is rotationally asymmetrical with one semi-meridian that is shorter than a corresponding semi-meridian. An intermediate transition zone is formed integral with the periphery of the central zone, and a peripheral zone is formed integral with the periphery of the intermediate transition zone, forming a round contact lens.
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