Study the Mechanical Behavior of Contact Lenses

Abstract

The paper presents a study concerning mechanical behavior of contact lenses. There were considered different materials for contact lenses like: Conventional Hydrogel, Silicone-Hydrogel with different lens powers. The lenses were tested using a vertical test stand from Hans Schmidt, equipped with Imada force transducer. The lenses were “pushed” on a plane surface using a certain transducer accessory. Also, a FEM simulation of contact lenses was developed in Solidworks in order to study the lenses behavior for different peripheral curves, widths, junctions and lens diameter. There were considered the lens deflection, lens deformation and lens stresses. The diameter of a soft contact lens should be a specific amount larger than the actual corneal diameter. One conclusion of this study is: Contact lens diameter may be a better predictor than base curve is of lens behaviour on eye.