# Finite element simulations of laser refractive corneal surgery

A. Pandolfi,
Giorgio Fotia,
F. Manganiello

Technical Report 07/02, CRS4, Center for Advanced Studies, Research and Development in Sardinia, Number 07/02 - february 2007

We setup a mechanically based finite element model to evaluate the change in the shape of the human cornea induced by ablation of stromal tissue. By considering the deformability of the cornea, the model computes the change of the dioptric power resulting from ablative laser surgery. We use a 3-D finite element model of the human cornea, previously developed by the same authors. The solid geometry is discretized into finite elements by an automatic procedure which recovers the undeformed configuration. The geometry is defined in parametric form and can be characterized by individual geometrical data when available. A two-fiber reinforced hyperelastic material model, which accounts for the organization of the anisotropic collagen structure, is adopted to describe the stromal tissue. For the simulation of laser refractive surgery of myopic and astigmatic eyes, a geometrical correction of the corneal profile is included into the code. We show two examples of application of the model to the reshaping of a myopic and an astigmatic eye. Numerical results provide the postoperative shape of the cornea, the corrected refractive power, and the distribution of the stress throughout the stromal tissue

## BibTex references

@TechReport{PFM07a,
author = {Pandolfi, A. and Fotia, G. and Manganiello, F.},
title = {Finite element simulations of laser refractive corneal surgery},
institution = {CRS4, Center for Advanced Studies, Research and Development in Sardinia},
number = {07/02},
month = {february},
year = {2007},
address = {Cagliari, Italy},
note = {submitted to Engineering with Computers},
type = {techreport},
url = {http://publications.crs4.it/pubdocs/2007/PFM07a},
}

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