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RESEARCH PAPERS

Large Deformation Mechanics of the Enucleated Eyeball

[+] Author and Article Information
L. A. Taber

Department of Mechanical Engineering, University of Rochester, Rochester, N.Y. 14627

J Biomech Eng 106(3), 229-234 (Aug 01, 1984) (6 pages) doi:10.1115/1.3138487 History: Received October 12, 1983; Revised February 03, 1984; Online June 15, 2009

Abstract

Large deformation of enucleated pig eyeballs under rigid cylindrical indenters was studied analytically and experimentally. The analytic model for the eyeball consists of a fluid-filled spherical membrane composed of an incompressible, elastic material with an exponential strain energy function. The Rayleigh-Ritz technique provided an approximate solution via a potential energy formulation. Comparison with results from tests on eyeballs and a water-filled rubber (Mooney-Rivlin) shell shows good agreement at large deflection, where membrane action dominates. Due to the highly nonlinear stress-strain relations for the sclera, the load remains relatively small until the indenter displacement approaches 40–60 percent of the eyeball radius, and then the load increases rapidly. Depending on the indenter size, either a perforation or a rupture type of failure occurs.

Copyright © 1984 by ASME
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