VARIABLE MODULUS CORNEAL IMPLANT AND FABRICATION METHODS
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United States of America Patent
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Issued Date -
Jan 24, 2002
app pub date -
Nov 4, 1998
filing date -
Nov 4, 1998
priority date (Note) -
Abandoned
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Abstract
An intracorneal implant has a geometry bounded by a ring-shaped section of a cone, approximating a section of a sphere. The intracomeal implant has at least one region of modified elasticity. Typically, the intracorneal implant will have two or more regions of modified elasticity circumferentially spaced around the implant. The regions of modified elasticity affect the cone angle of the implant within each region and hence the corrective power of each region on the cornea. The intracorneal ring implant can be used for correction of various refractive defects of the vision, in particular, astigmatism or astigmatism combined with myopia or hyperopia. The implant may be formed as a ring, split ring, gapped ring or one or more segments of a ring.
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