Contact lenses with off-center sphere surface
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United States of America Patent
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Apr 26, 2005
Grant Date -
Aug 28, 2003
app pub date -
Feb 11, 2003
filing date -
Feb 14, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides a contact lens comprising a convex surface and a concave surface, one or both of the surfaces comprising: a) a central optical zone that is an aspherical sub-surface; b) a transition zone that is adjacent to said central optical zone, wherein and is a rotationally symmetric off-center sphere sub-surface; and c) a peripheral zone that comprises one or more sphere sub-surfaces, wherein all sub-surfaces are tangent to each other. By having a transition zone of the present invention, flexion points at the junction of optical zone with peripheral zone can be eliminated. The present invention also provides a method for producing a contact lens of the present invention.
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