Biomedical subjects
Publications and source records attributed to P H Carnell.
A finite element model that simulates indentation of the cornea was generated to examine the feasibility of using indentation data to determine mechanical properties. A layered model which included geometric nonlinearities was necessary to characterize the indentation process. Results indicate that a secant modulus could be determined by measuring indenter force and contact area.
BACKGROUND: In this article, we examine the finite element method and its use in mechanical modeling of the cornea. METHODS: Both linear elastic and geometrically nonlinear models are considered. The effects of corneal geometry, boundary conditions, thickness, and the number of layers in the model are determined. RESULTS: Results indicate that, for intraocular pressure loading, the thickness and the choice of boundary conditions at the limbus are significant. CONCLUSIONS: A model of tonometry showed that simulating the layered nature of the cornea and including the increased flexibility of large deformation are critical.