Contact lens
First Claim
Patent Images
1. A contact lens for use on an asymmetric aspherical cornea, said lens comprising:
- an anterior surface, a posterior surface and a base, said posterior surface comprising an outer peripheral scleral portion, which is asymmetric and aspheric and is coextensive with the base of the lens, and an inner center portion;
wherein a boundary between said outer peripheral scleral portion and said center portion is non-circular.
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Accused Products
Abstract
A contact lens for use with an asymmetric aspherical cornea. The lens includes an anterior surface, a posterior surface and a base. The posterior and anterior surfaces each include a center optical portion and an outer peripheral corneal portion. The posterior surface is divided into a plurality of local surface segments by a plurality of radially extending boundaries that originate from a common center point on the posterior surface of the lens. Each of the local surface segments conforms to the shape of a corresponding local surface portion of the cornea that lies under the respective lens local surface segment when the lens is worn on the eye.
136 Citations
13 Claims
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1. A contact lens for use on an asymmetric aspherical cornea, said lens comprising:
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an anterior surface, a posterior surface and a base, said posterior surface comprising an outer peripheral scleral portion, which is asymmetric and aspheric and is coextensive with the base of the lens, and an inner center portion; wherein a boundary between said outer peripheral scleral portion and said center portion is non-circular.
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2. A method of manufacturing a contact lens comprising the steps of:
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scanning a cornea to generate data that corresponds to the surface of the cornea; generating a cornea matching surface from the data; determining a high point on the cornea matching surface; generating a base about the high point; generating a plurality of radially extending splines from said cornea matching surface, each of said plurality of splines originating from said high point and extending radially outwardly to said base, each of said splines matching a corresponding local surface portion of the cornea; generating a first drive rail, said first drive rail corresponding to a boundary between an optical portion of said lens and a topography matching portion of a posterior surface of said lens; generating a plurality of local surface segments between the boundaries formed by the intersection of the splines and the first drive rail and the base, each of said local surface segments on said posterior surface in said optical portion conforming to the shape of a corresponding local surface portion of the cornea that lies under said respective lens local surface segment when the lens is worn on the eye; and cutting a contact lens having a posterior and anterior surface matching said plurality of local surface segments. - View Dependent Claims (3, 4, 5, 6, 7)
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8. An orthokeratology contact lens for use on an eye with an asymmetric aspheric cornea, said lens comprising:
an anterior surface, a posterior surface and a base, said posterior and anterior surfaces each comprising a center optical portion, an inner peripheral optical portion and an outer peripheral corneal portion, said posterior surface of said center optical portion displacing a first volume of said cornea underlying said center optical portion, said posterior surface of said inner peripheral portion receiving a second displaced predetermined volume of said cornea underlying said inner peripheral optical portion. - View Dependent Claims (9, 10, 11, 12, 13)
Specification