Patent ID: 6010219
Filing Date: 2000-01-04
Classification: G02C

Abstract:
A corneal contact lens adapted for use in orthokeratology, said contact lens comprising:a lens body having a posterior surface which is located adjacent to the surface of a patient's eye and an anterior surface, said lens body comprising:a central zone of said posterior surface having a central zone radius of curvature;a tear zone of said posterior surface which is located concentrically around said central zone, said tear zone being integral with said central zone and having a tear zone radius of curvature wherein said tear zone radius of curvature is smaller than said central zone radius of curvature to provide a tear reservoir located between the tear zone and the surface of the eye;one or more fenestration surfaces located only in said tear zone, said fenestration surfaces defining openings extending through said lens body from the tear zone of said posterior surface to the anterior surface of said lens body to thereby provide a passageway for fluid through said lens body to alleviate fluid pressure which may build up in said tear reservoir, said passageway having a posterior end at the tear zone of said posterior surface which is displaced away from the surface of said patient's eye and separated therefrom by said tear reservoir; anda peripheral zone of said posterior surface which is located concentrically around said tear zone, said peripheral zone being integral with said tear zone and having a peripheral zone radius of curvature wherein said peripheral zone radius of curvature is greater than, equal to or smaller than said central zone radius of curvature.