Contact lens for keratoconus
AssigneeVicoh, LLC
InventorJerome A. Legerton
Life of this patent
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Abstract
The present invention is directed to a non-deforming contact lens for keratoconus patients having a displaced central zone. In particular, the central zone is displaced from the geometric center of the lens. The shape of the central zone is egg or spoon-shaped and is rotationally asymmetrical with one semi-meridian that is shorter than a corresponding semi-meridian. An intermediate transition zone is formed integral with the periphery of the central zone, and a peripheral zone is formed integral with the periphery of the intermediate transition zone, forming a round contact lens.
Claims20
A contact lens for keratoconus having a posterior surface facing toward an eye having at least three zones, comprising:
- a central zone displaced from a two-dimensional geometric center of the contact lens, wherein the central zone is rotationally asymmetrical having a meridian with a first semi-meridian shorter in radius than a corresponding second semi-meridian;
- an intermediate transition zone formed integral with a periphery of the central zone;
- and
- a peripheral zone formed integral with a periphery of the intermediate transition zone.
A contact lens for keratoconus having a posterior surface facing toward an eye having at least three zones, comprising:
- a central zone displaced from a two-dimensional geometric center of the contact lens, wherein the central zone is rotationally asymmetrical having a meridian with a first semi-meridian with an eccentricity different than a corresponding second semi-meridian;
- an intermediate transition zone formed integral with a periphery of the central zone;
- and
- a peripheral zone formed integral with a periphery of the intermediate transition zone.
Dependencies are inferred from the claim text.