Optical Property Changes in Deformable Lenses

Abstract

The purpose of this research has been to develop a model to predict the change in optical parameters of a lens due to imposed mechanical deformation. Single curve and double curve lens models were developed using geometrical parameters taken from contact lenses. Deformation was imposed on the surface of the lens and the change in the radius of curvature and focal length were computed. Analytical models as well as two dimensional and three dimensional finite element models were developed. The finite element models consider loading situations and the impacts on the lens radius of curvature, as well as the ability of the lens to focus on a single point. The three dimensional models show a change in focal length corresponding to a power change of two diopters for modest imposed deformations. Analysis of the model suggests lens materials with lower elastic moduli have more advantageous lens properties. The model suggests larger deformation would give larger power changes if desired.