Bifocal implant and method for altering the refractive properties of the eye
First Claim
1. A method of altering the refractive properties in an eye, comprising the steps of separating layers of the cornea to form a first corneal layer and a second corneal layer, the first corneal layer facing in a posterior direction and the second corneal layer facing in an anterior direction, inserting an implant between the first corneal layer and the second corneal layer, said implant including a first portion and a second portion, said first portion adapted to alter the refractive properties of the eye and the said second portion adapted to correct error, including error caused by said first portion.
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Abstract
The present invention relates to an implant for insertion between layers of the cornea. The Implant includes a first portion adapted to change the curvature of the cornea at first area and thereby alter the refractive properties of the cornea at the first area, and a second portion adapted to change the refractive properties of a second area of the eye adjacent the first area and compensate for error at the second area caused by the first area change in curvature.
79 Citations
22 Claims
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1. A method of altering the refractive properties in an eye, comprising the steps of
separating layers of the cornea to form a first corneal layer and a second corneal layer, the first corneal layer facing in a posterior direction and the second corneal layer facing in an anterior direction, inserting an implant between the first corneal layer and the second corneal layer, said implant including a first portion and a second portion, said first portion adapted to alter the refractive properties of the eye and the said second portion adapted to correct error, including error caused by said first portion.
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7. An implant adapted to be positioned between a first surface of the cornea and a second surface of the cornea for altering refractive properties of an eye, comprising:
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a first portion adapted to alter the refractive properties of a predetermined first area of the eye by displacing the first surface of the cornea at said first predetermined area, thereby changing the curvature of the cornea at said first predetermined area; and
a second portion adapted to alter the refractive properties of a predetermined second area of the eye adjacent said first predetermined area, said second portion further adapted to compensate for error at said predetermined second area caused by said first portion. - View Dependent Claims (8, 9, 10, 11)
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12. An implant for insertion between layers of the cornea, comprising:
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a first portion adapted to change the curvature of the cornea at first area and thereby alter the refractive properties of the cornea at said first area; and
a second portion adapted to change the refractive properties of a second area of the eye adjacent the first area and compensate for error at said second area caused by said first area change in curvature. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of forming a multifocal implant for insertion between layers of a cornea of an eye, the implant configured to change the refractive properties of the eye, the method comprising the steps of
determining a first refractive error of a first condition in the eye, forming a first portion of the implant such that the first portion is configured to alter the corneal curvature at a first predetermined area of the eye and thus correct the first refractive error at the first predetermined area, determining a refractive error caused by the first portion altering the corneal curvature at a second predetermined area of the eye, and forming a second portion of the implant such that the second portion of the implant is configured to alter the corneal curvature at the second predetermined area and thus correct the refractive error caused by the first portion.
Specification