Method of calculating the required power of a toric implant

US8764822B2 · kind B2 · utility

Assignee

• Novartis AG · CH

Inventors

• Blake Harris · Logan, US
• James T. Hoffman · Alameda, US
• Xin Hong · Arlington, US
• Xiaoxiao Zhang · Fort Worth, US
• Warren E. Hill · Mesa, US

Key dates

• Filing date: Dec 4, 2008
• Grant date: Jul 1, 2014
• Expiry date: Jun 2, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2240/001
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method for calculating the required power of a toric implant by using both the measured pre-operative corneal astigmatism and the predicted surgically-induced post-operative astigmatism. The surgically-induced post-operative astigmatism is predicted using power vector analysis of the surgical technique employed by the surgeon. Such a method provides a more accurate method of calculating the required post-operative refractive power of the implant. The method can be implemented manually, but preferably is automated by implementation on a computer through appropriate software.