An intraocular lens, with equal conic surfaces, is intended to replace the
crystalline lens in the posterior chamber of a patient's eye, in
particular after a cataract extraction. The lens provides optical power
to focus objects onto a patient's retina. In addition the lens surfaces
are shaped to reduce optical aberrations at the retina and are tolerant
to lens tilt and decentration within the eye. The lens is designed to
have zero longitudinal ray aberrations at a specific ray height.