Patent ID: 7052133

Claim:
A contact lens, comprising a posterior surface and an opposite anterior surface, wherein the anterior surface includes a vertical meridian, a horizontal meridian, a central optical zone, a peripheral zone, an edge zone, a first blending zone extending outwardly from the central optical zone to the peripheral zone and providing a continuous transition from the central optical zone to the peripheral zone, a second blending zone extending outwardly from the peripheral zone to the edge zone and providing a continuous transition from the peripheral zone to the edge zone; wherein the anterior surface has a mirror symmetry with respect to a vertical meridian plane and is continuous at least in first derivative, wherein contact lens is weighed at its lower half portion by varying lens thickness within the peripheral zone and second blending zone to cause it to come to an equilibrium position on the eye, and wherein the contact lens has a lens thickness profile characterized by that lens thickness, in a sector bounded by two sector-bounding semi-meridians at an equal angle of from about 35 degrees to about 135 degrees relative to the lower portion of the vertical meridian and by a portion of the edge included between the two sector-bounding semi-meridians, increases gradually from the inner boundary of the peripheral zone along each semi-meridian until reaching a lens thickness maximum and then decreases.