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Related Experiment Video

Updated: Sep 30, 2025

Corneal Tissue Engineering: An In Vitro Model of the Stromal-nerve Interactions of the Human Cornea
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Multiscale mechanical model based on patient-specific geometry: Application to early keratoconus development.

C Giraudet1, J Diaz1, P Le Tallec1

  • 1LMS, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, France; Inria, France.

Journal of the Mechanical Behavior of Biomedical Materials
|March 15, 2022
PubMed
Summary

Keratoconus, a corneal disease, is primarily caused by mechanical weakening of collagen lamellae, not geometry changes. Early diagnosis should focus on detecting this weakening for effective stiffening treatments.

Keywords:
Cornea mechanicsKeratoconusPatient-specific modeling

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Area of Science:

  • Biomechanical modeling
  • Ocular biomechanics
  • Corneal pathology

Background:

  • Keratoconus involves corneal thinning and mechanical weakening, but the primary cause remains unclear.
  • Understanding the interplay between geometry and mechanics is crucial for diagnosing and treating keratoconus.

Purpose of the Study:

  • To investigate whether geometric changes or mechanical weakening drives keratoconus progression.
  • To simulate the mechanical response of healthy and keratoconic corneas using a multiscale model.

Main Methods:

  • Developed a multiscale model incorporating corneal matrix, collagen lamellae structure, and quasi-incompressibility.
  • Utilized a micro-sphere description to model collagen lamellae orientation, stiffness, dispersion, and unfolding stretch.
  • Simulated corneal response to intraocular pressure using patient-specific geometry.

Main Results:

  • Corneal apex displacement is highly sensitive to the unfolding stretch parameter of collagen lamellae.
  • Simulated changes in SimK (corneal curvature) and elevation maps were reproduced by mechanical weakening of lamellae, not geometric alterations.
  • Mechanical weakening of lamellae, not the matrix, explains keratoconus-like changes.

Conclusions:

  • Mechanical weakening of corneal lamellae is the leading cause of keratoconus, not geometric changes.
  • Early keratoconus diagnosis should target mechanical weakening.
  • Stiffening treatments targeting collagen lamellae show therapeutic potential.