Finite-element modeling of intrastromal ring segment implantation into a hyperelastic cornea.

@article{Kling2013FiniteelementMO,
  title={Finite-element modeling of intrastromal ring segment implantation into a hyperelastic cornea.},
  author={Sabine Kling and Susana Marcos},
  journal={Investigative ophthalmology \& visual science},
  year={2013},
  volume={54 1},
  pages={
          881-9
        }
}
  • S. Kling, S. Marcos
  • Published 30 January 2013
  • Medicine
  • Investigative ophthalmology & visual science
PURPOSE Intrastromal corneal-ring segments (ICRSs) are applied to improve highly distorted vision in keratoconic, myopic, and astigmatic patients. Selections of ICRS geometry and position are primarily based on empirical nomograms. We developed a finite-element model (FEM) predicting the corneal response to different ICRS geometries in normal and keratoconic corneas. METHODS A two-dimensional FEM was built in proprietary software (ANSYS-APDL), consisting of hyperelastic ocular tissues (cornea… 
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TO STUDY THE EFFECTS OF INTRASTROMAL CORNEAL RING GEOMETRY AND SURGICAL CONDITIONS ON THE POSTSURGICAL OUTCOMES THROUGH FINITE ELEMENT ANALYSIS
TLDR
Finite element (FE) analysis techniques are used to develop a high fidelity and computationally efficient three-dimensional axisymmetric cornea model to study the relative effects of ICR implant geometry and surgical conditions on the postsurgical shape of the cornea utilizing corneal apical displacement results.
Biomechanical Modeling of Femtosecond Laser Keyhole endokeratophakia Surgery.
TLDR
Finite element modeling of the cornea reproduced the clinically observed anterior and posterior corneal surface changes following an endokeratophakia procedure, and sets the stage for further study to refine and yield predictive finite element modeling for the evaluation of cornea refractive surgical procedures.
Template-based methodology for the simulation of intracorneal segment ring implantation in human corneas
TLDR
A semi-automatic computational methodology is presented in order to simulate the ICRS surgical operation and to predict the post-surgical optical outcomes, and supports that rings are acting as restraint elements which relax the stresses of the corneal stroma in the cone of the disease.
Quantitative OCT-based longitudinal evaluation of intracorneal ring segment implantation in keratoconus.
TLDR
Spectral OCT (sOCT) provided with distortion correction and analysis tools, is an excellent instrument for evaluating the changes produced by ICRS in keratoconic corneas, and for analyzing the 3D ICRS position during the follow up.
Effects of Different Corneal Ring Segments with Identical Total Arc Length on Keratoconic Eyes: A Finite Element Study
TLDR
The results showed that under normal physiological range of intraocular pressures (IOPs), the two selected ICRSs caused slightly different deformations in the same in-silico keratoconic eye model.
Corneal Biomechanics After Intrastromal Ring Surgery: Optomechanical In Silico Assessment
TLDR
A biomechanical framework to better understand the postsurgical optomechanical behavior of the cornea after ring implantation is provided and implants do not stiffen the corneal shape but create a local bulkening effect that regularizes the corNEal shape by modifying corneAL kinematics without canceling corneals motion.
A Simple Numerical Approach to Mimic MyoRing Surgery in Keratoconus Corneas based on Optical Coherence Tomography
TLDR
The study aimed to develop a novel Methodology for numerical simulation of MyoRing surgery by adopting a simple representation of the corneal geometry and material model to investigate the relative contribution of ring diameter and thickness to the keratometry data of keratoconus cornea predicted by a hyperelastic finite element model.
Patient-specific simulation of the intrastromal ring segment implantation in corneas with keratoconus.
Effects of intracorneal ring segments implementation technique and design on corneal biomechanics and keratometry in a personalized computational analysis
TLDR
The developed methodology provided a platform to personalize ICRS refractive surgery with regard to the patient’s keratoconus stage in order to facilitate the efficiency and biomechanical stability of the surgery.
Effects of intracorneal ring segments on the biomechanical response of the ectatic cornea to air-puff: A patient-specific numerical analysis
TLDR
The developed numerical model demonstrated the direct correlation of the ICRS insertion site with induced contact stresses and ICRS position stability and the proposed approach can be assessed as a robust and novel framework for planning optimized corneal refractive surgeries.
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