Hybrid contact lens system and method of fitting
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United States of America Patent
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May 26, 2009
Grant Date -
Nov 29, 2007
app pub date -
May 25, 2006
filing date -
May 25, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A hybrid contact lens comprises a substantially rigid zone having a base curve with a first curved section defined by an apical radius and an aspheric section defined by a conic constant. A substantially flexible hydrophilic peripheral portion is coupled to the substantially rigid zone, the peripheral portion having one of a plurality of radii, wherein a conic constant of the aspheric section varies with apical radius, so as to provide a nearly constant deviation between the aspheric shape of the aspheric section and a sphere having a radius equal to the apical radius, regardless of the length of the apical radius.
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