Share Email Print
cover

Journal of Biomedical Optics

Finite element analysis applied to cornea reshaping
Author(s): Delia Cabrera Fernandez; Abdel-Salam M. Niazy; Ronald M. Kurtz; Gagik P. Djotyan; Tibor Juhasz
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A 2-D finite element model of the cornea is developed to simulate corneal reshaping and the resulting deformation induced by refractive surgery. In the numerical simulations, linear and nonlinear elastic models are applied when stiffness inhomogeneities varying with depth are considered. Multiple simulations are created that employ different geometric configurations for the removal of the corneal tissue. Side-by-side comparisons of the different constitutive laws are also performed. To facilitate the comparison, the material property constants are identified from the same experimental data, which are obtained from mechanical tests on corneal strips and membrane inflation experiments. We then validate the resulting models by comparing computed refractive power changes with clinical results. Tissue deformations created by simulated corneal tissue removal using finite elements are consistent with clinically observed postsurgical results. The model developed provides a much more predictable refractive outcome when the stiffness inhomogeneities of the cornea and nonlinearities of the deformations are included in the simulations. Finite element analysis is a useful tool for modeling surgical effects on the cornea and developing a better understanding of the biomechanics of the cornea. The creation of patient-specific simulations would allow surgical outcomes to be predicted based on individualized finite element models.

Paper Details

Date Published: 1 November 2005
PDF: 11 pages
J. Biomed. Opt. 10(6) 064018 doi: 10.1117/1.2136149
Published in: Journal of Biomedical Optics Volume 10, Issue 6
Show Author Affiliations
Delia Cabrera Fernandez, Univ. of Miami (United States)
Abdel-Salam M. Niazy, The Aerospace Corp. (United States)
Ronald M. Kurtz, Univ. of California/Irvine (United States)
Gagik P. Djotyan, Univ. of Michigan (United States)
Tibor Juhasz, IntraLase Corp. (United States)


© SPIE. Terms of Use
Back to Top