Patent ID: 7780290

Claim:
A multi-zonal ophthalmic lens comprising: an optic having a pupil; a first zone having a first astigmatism, the first astigmatism having a first astigmatism magnitude and a first astigmatism orientation; and a second zone surrounding the first zone and having a second astigmatism, the second astigmatism having a second astigmatism magnitude equal to the first astigmatism magnitude and a second astigmatism orientation different from the first astigmatism orientation, an average axis of orientation of astigmatism of all zones of the ophthalmic lens, 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; wherein, when the ophthalmic lens disposed within the eye, the ophthalmic lens is less sensitive to rotational misalignment between the average axis and the astigmatic axis of the eye than a reference optic having first and second zones that are equal to the first and second zones of the ophthalmic lens, except that the first and second zones of the reference optic have a same astigmatism orientation.