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TECHNICAL PAPERS

Constitutive Laws for Biomechanical Modeling of Refractive Surgery

[+] Author and Article Information
Michael R. Bryant, Peter J. McDonnell

Doheny Eye Institute and Department of Ophthalmology, University of Southern California School of Medicine, Los Angeles, CA 90033

J Biomech Eng 118(4), 473-481 (Nov 01, 1996) (9 pages) doi:10.1115/1.2796033 History: Received March 30, 1994; Revised September 23, 1995; Online October 30, 2007

Abstract

Membrane inflation tests were performed on fresh, intact human corneas using a fiber optic displacement probe to measure the apical displacements. Finite element models of each test were used to identify the material properties for four different constitutive laws commonly used to model corneal refractive surgery. Finite element models of radial keratotomy using the different best-fit constitutive laws were then compared. The results suggest that the nonlinearity in the response of the cornea is material rather than geometric, and that material nonlinearity is important for modeling refractive surgery. It was also found that linear transverse isotropy is incapable of representing the anisotropy that has been experimentally measured by others, and that a hyperelastic law is not suitable for modeling the stiffening response of the cornea.

Copyright © 1996 by The American Society of Mechanical Engineers
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