Method and apparatus for online contact lens evaluation

US7771053B2 · kind B2 · utility

Assignee

• BAUSCH & LOMB INCORPORATED · US

Inventors

• Hans-Joachim Polland · Wolfratshausen, DE
• Stefan Seitz · Windach, DE
• Kristian Hohla
• Gerhard Youssefi · Landshut, DE
• Ernst Hegels · Munich, DE
• Birte Jansen · Birkenfeld, DE
• Christoph Sappel · Winnweiler, DE

Key dates

• Filing date: Jul 22, 2004
• Grant date: Aug 10, 2010
• Expiry date: May 20, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/047
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A selectively marked contact lens having, in one aspect, marks in an optical zone region on a surface thereof and, in another aspect, different marks outside an optical zone region of the lens, for an in-vivo lens. With the lens in-vivo, the subject's eye is illuminated and the lens is imaged. A fast algorithm is used to determine the mark coordinates in relation to a measured pupil coordinate to determine position and/or orientation of the contact lens. A wavefront aberration measurement can also be obtained simultaneously with the contact lens position measurement, as well as pupil size. A fast algorithm provides for online measurements; i.e., at a repetition rate of 10 Hz or greater, over a selected time interval. Blinking periods are determined and anomalous lens position and/or wavefront information is discarded. A most frequently occurring wavefront and/or contact lens position/orientation is determined over the selected time interval.