A numerical model of light adjustable lens |
| |
Authors: | Anna Pandolfi Michael Ortiz |
| |
Affiliation: | (1) Dipartimento di Ingegneria Strutturale, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;(2) Division of Aeronautics and Applied Mechanics, California Institute of Technology, Pasadena, CA 91125, USA |
| |
Abstract: | We model numerically the mechanical effects of UV induced photo-polymerization in elastomeric artificial lens. The elastomer
is originated upon cross-linking of a silicone matrix. UV irradiation of one side of the lens polymerizes selectively a photosensitive
macromer, causing local variations of its concentration. The subsequent diffusion of macromers from high concentration to
low concentration zones modifies the shape of the lens and thus its dioptric power. In vitro experiments on artificial lens
showed that the power change is dependent on UV exposure time, irradiation intensity and light pattern. With the aim to define
a numerical tool able to predict the dioptric power adjustment as a function of the UV irradiation parameters, we setup a
purely mechanic finite element model of the lens, adopting a hyperelastic material model embedded with eigen-deformations.
Numerical simulations of axis-symmetric irradiation closely reproduced the experimental results, in terms of both lens geometry
and dioptric power, for positive, negative and lock-in corrections. |
| |
Keywords: | Artificial lens Finite element Polymerization UV irradiation |
本文献已被 SpringerLink 等数据库收录! |
|