Patent ID: 8668331

Claim:
A method for forming non-round contact lenses for improving lens stability, rotation and centration on the eye, the method comprising: determining the geometry of an upper eyelid of at least one eye of a patient; determining the surface geometry of the ocular surface of at least one eye of the patient; setting an initial geometric shape of the outer contour of a non-round contact lens; calculating a first surface area overlap between the upper eyelid and a superior portion of the non-round contact lens when the non-round contact lens is at its optimal final position on the eye based upon the geometry of the ocular surface; calculating a second surface area overlap between the upper eyelid and a superior portion of the non-round contact lens when the non-round contact lens is at its least optimal position on the eye based upon the geometry of the ocular surface; maximizing the difference between the first and second surface area overlaps by changing the geometric shape of the outer contour of the non-round contact lens; and fabricating a non-round contact lens from the maximized difference.