Lens such as contact lens for compensating for aberration, has freeform rear surface compensated by freeform front surface taking account of refractive indices of media

摘要

The rear surface of the lens has a freeform surface which forms a characteristic aberration in medium n", which is compensated by the freeform surface of the lens front surface in medium n, taking account of the refractive indices of air, contact lens material, and lacrimal fluid, when the lens lies on the cornea. An independent claim is included for a contact lens.