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Simulation and Optical Characterization of Focus-Variable Liquid Lenses as an IOL

The talk will be about a feasibility study of a new type of lens implant for the human eye. A primary shortcoming of today’s common Intra Ocular Lenses (IOLs) is that accommodation is not possible. With the new ‘liquid lens technology’, we can provide the ability to change the power of the implanted lens after surgery. The liquid lens uses two isodensity liquids, one is an insulator while the other is a conductor. The variation of voltage leads to a change of curvature of the liquid-liquid interface, which in turn leads to a change of the focal length of the lens. The electrical and optical properties of the liquid lens were obtained by means of an optical experiment. Based on the experimental values found, a theoretical model of the lens will be presented. The feasibility of the new liquid lens technology can be investigated by combining the lens model with a schematic eye model. Optical calculations show the necessity for an improvement of the optical quality and stability, but the simulations also demonstrate a good chance for the realization of focus-variable liquid lenses as an IOL. The future outlook of the implant will also be presented, including improvement of the optical quality, electrical requirements and controlling the focus.

Type of Seminar:
Ph.D. Seminar
Dipl.-Ing. Martin Wieser
ETH Zurich
Jul 10, 2006   16:00

ETL K 25
Contact Person:

Dr. Thierry Keller
No downloadable files available.
Biographical Sketch:
Martin Wieser was born in Landshut, Germany. He took his undergraduate degree at Technical University Munich and his Master degree at ETH Zurich, both in Electrical Engineering. He worked as an independent researcher at Fraunhofer Institute for Biomedical Engineering (St. Ingbert, Germany), Northwestern University (Chicago, USA) and IROC AG (Zurich, Switzerland). His interests are in the area of rehabilitation engineering, Functional Electrical Stimulation (FES) and medical optics.