Abstract: The disclosed ophthalmic lens includes a posterior surface and an anterior surface having a spherical central optical correction zone, an aspheric intermediate zone, and a peripheral zone. The intermediate and peripheral zones are not used for optical correction. The posterior surface includes a central optical zone, an intermediate zone, and a peripheral zone. The central optical zone of the anterior surface has a larger diameter than the central optical zone of the posterior surface. Similarly, the intermediate zone of the anterior surface has a larger diameter than the intermediate zone of the posterior surface. The inventive construction is particularly beneficial when applied to a rigid contact lens, particularly rigid contact lenses made using a high DK material.

Abstract: The disclosed ophthalmic lens includes a posterior surface and an anterior surface having a spherical central optical correction zone, an aspheric intermediate zone, and a peripheral zone. The intermediate and peripheral zones are not used for optical correction. The posterior surface includes a central optical zone, an intermediate zone, and a peripheral zone. The central optical zone of the anterior surface has a larger diameter than the central optical zone of the posterior surface. Similarly, the intermediate zone of the anterior surface has a larger diameter than the intermediate zone of the posterior surface. The inventive construction is particularly beneficial when applied to a rigid contact lens, particularly rigid contact lenses made using a high DK material.

Abstract: The disclosed ophthalmic lens includes a posterior surface and an anterior surface having a spherical central optical correction zone, an aspheric intermediate zone, and a peripheral zone. The intermediate and peripheral zones are not used for optical correction. The posterior surface includes a central optical zone, an intermediate zone, and a peripheral zone. The central optical zone of the anterior surface has a larger diameter than the central optical zone of the posterior surface. Similarly, the intermediate zone of the anterior surface has a larger diameter than the intermediate zone of the posterior surface. The inventive construction is particularly beneficial when applied to a rigid contact lens, particularly rigid contact lenses made using a high DK material.

Abstract: A contact lens is constructed with an anterior surface which is radially unsymmetrical and a posterior surface which is composed of multiple curves. The lens is designed to properly adhere and center on the cornea. An aperture or hole is formed in the peripherally located curves, for locally enabling an increase in the magnitude of the fluid forces acting upon the lens. In a properly constructed contact lens, this increase in the fluid forces acting upon the lens creates an effect for tightening the lens fit in the sector of the lens which contains the aperture or hole. Clinically, this sector tightening effect has a magnitude which is capable of holding a properly tailored contact lens, stable in a specifically desired vertical orientation.