Patent ID: 7828435
Filing Date: 2010-11-09
Classification: G02C

Abstract:
1. A method of designing an anterior curve of a contact lens for the eye of a patient comprising the steps of: providing a contact lens material having a posterior, a posterior curve having a predetermined asphericity, an anterior, an index of refraction and a center thickness; providing a geometry of a cornea, a distance power correction for the cornea and a near power correction for the cornea; determining a central distance power of the contact lens in air; calculating a central anterior radius of the contact lens using the posterior curve of the contact lens material, the index of refraction of the contact lens material, the center thickness of the contact lens material and the central distance power of the contact lens in air; calculating a center power of the contact lens on the eye of the patient using the index of refraction of tears at the posterior of the contact lens; and using an on-eye ray trace, said on-eye ray trace having a null lens compensation to create a targeted on-eye power profile.