The Distribution of Pressure Behind a Soft Contact Lens

[+] Author and Article Information
J. T. Jenkins, M. Shimbo

Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, N.Y. 14853

J Biomech Eng 106(1), 62-65 (Feb 01, 1984) (4 pages) doi:10.1115/1.3138458 History: Received April 30, 1983; Revised September 13, 1983; Online June 15, 2009


We determine the pressure distribution behind a soft contact lens that is necessary to keep the lens in conformity with an axisymmetric substrate. The substrate consists of two regions: a central portion, the cornea, supposed to be an ellipsoid; and a peripheral region, the sclera, taken to be a sphere. The pressure is obtained as part of a numerical solution of the axisymmetric equilibrium equations for an initially curved, linearly elastic membrane. The relaxed shape of the lens is assumed to be an axisymmetric ellipsoid with a central curvature and a shape factor different from those of the cornea. The variation in the thickness of the lens from its center to edge is approximated by a polynomial. Pressure distributions are obtained for several typical soft contact lens fittings.

Copyright © 1984 by ASME
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