Patent ID: 8215771

Claim:
A method of improving the vision of an eye having a cornea, the cornea having a cornea astigmatism, the cornea astigmatism having a cornea astigmatism amount and a cornea astigmatism orientation, with a lens, the method comprising: dividing a pupil of the lens into an inner discrete pupil segment and an outer discrete pupil segment which surrounds the inner discrete pupil segment; and providing an astigmatism to each discrete pupil segment, each astigmatism having an astigmatism amount and an astigmatism orientation; wherein the astigmatism amounts of each pupil segment is equal to a lens astigmatism amount; wherein the astigmatism orientations of each pupil segment is different from each other; wherein each pupil segment provides for an average axis of orientation of astigmatism, the average axis configured to be aligned to an astigmatic axis of an eye, the astigmatic axis of the eye having a constant magnitude and orientation; and wherein when the lens is disposed within the eye, the lens is less sensitive to rotational misalignment between the average axis and the astigmatic axis of the eye than a reference optic having pupil segments that are equal to each pupil segment of the lens, except that the pupil segments of the reference optic have a same astigmatic orientation.