Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.

Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.

<h4>Purpose</h4>To evaluate the local geometric effects of a unilateral intrastromal ring segment with a combined variation of ring thickness and base width in a finite element simulation, and to compare it against the isolated effect of thickness or base width variation alone.<h4>...

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Autores principales: Gonzalo García de Oteyza, Juan Álvarez de Toledo, Rafael I Barraquer, Sabine Kling
Formato: article
Lenguaje:EN
Publicado: Public Library of Science (PLoS) 2021
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spelling oai:doaj.org-article:42695fea696e417eba95dac9cc6f81fd2021-12-02T20:06:16ZRefractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.1932-620310.1371/journal.pone.0257222https://doaj.org/article/42695fea696e417eba95dac9cc6f81fd2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0257222https://doaj.org/toc/1932-6203<h4>Purpose</h4>To evaluate the local geometric effects of a unilateral intrastromal ring segment with a combined variation of ring thickness and base width in a finite element simulation, and to compare it against the isolated effect of thickness or base width variation alone.<h4>Methods</h4>A two-dimensional finite-element model of a transversely isotropic cornea was created assuming either axisymmetric stress or plane strain condition. The model geometry was composed of a three-layered corneal tissue (epithelium, anterior and posterior stroma) fixed at the limbus. The implantation of a triangular-shape asymmetric ring segment with varying ring thickness (150 to 300 μm) and base width (600 to 800 μm) was simulated. Also, changes induced by thickness or base width alone were studied and compared their combined effect in the asymmetric ring segment. Geometrical deformation of the simulated cornea and sagittal curvature were the main parameters of study.<h4>Results</h4>Increasing ring thickness and base width along the arc of the asymmetric ring segment produced a more pronounced flattening in this part of the ring. The asymmetric design did find a good balance between maximizing corneal flattening at one end and minimizing it at the other end, compared to the isolated effect of ring thickness and width. Ring thickness was the most robust parameter in flattening both, the central and peripheral cornea.<h4>Conclusion</h4>The finite-element model permitted a theoretical study of corneal deformation undergoing implantation of realistic and hypothetical ring geometries. Intracorneal asymmetric ring segments with varying thickness and base width can be a good alternative in corneas with asymmetric keratoconus phenotypes.Gonzalo García de OteyzaJuan Álvarez de ToledoRafael I BarraquerSabine KlingPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 9, p e0257222 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Gonzalo García de Oteyza
Juan Álvarez de Toledo
Rafael I Barraquer
Sabine Kling
Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.
description <h4>Purpose</h4>To evaluate the local geometric effects of a unilateral intrastromal ring segment with a combined variation of ring thickness and base width in a finite element simulation, and to compare it against the isolated effect of thickness or base width variation alone.<h4>Methods</h4>A two-dimensional finite-element model of a transversely isotropic cornea was created assuming either axisymmetric stress or plane strain condition. The model geometry was composed of a three-layered corneal tissue (epithelium, anterior and posterior stroma) fixed at the limbus. The implantation of a triangular-shape asymmetric ring segment with varying ring thickness (150 to 300 μm) and base width (600 to 800 μm) was simulated. Also, changes induced by thickness or base width alone were studied and compared their combined effect in the asymmetric ring segment. Geometrical deformation of the simulated cornea and sagittal curvature were the main parameters of study.<h4>Results</h4>Increasing ring thickness and base width along the arc of the asymmetric ring segment produced a more pronounced flattening in this part of the ring. The asymmetric design did find a good balance between maximizing corneal flattening at one end and minimizing it at the other end, compared to the isolated effect of ring thickness and width. Ring thickness was the most robust parameter in flattening both, the central and peripheral cornea.<h4>Conclusion</h4>The finite-element model permitted a theoretical study of corneal deformation undergoing implantation of realistic and hypothetical ring geometries. Intracorneal asymmetric ring segments with varying thickness and base width can be a good alternative in corneas with asymmetric keratoconus phenotypes.
format article
author Gonzalo García de Oteyza
Juan Álvarez de Toledo
Rafael I Barraquer
Sabine Kling
author_facet Gonzalo García de Oteyza
Juan Álvarez de Toledo
Rafael I Barraquer
Sabine Kling
author_sort Gonzalo García de Oteyza
title Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.
title_short Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.
title_full Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.
title_fullStr Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.
title_full_unstemmed Refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite-element model.
title_sort refractive changes of a new asymmetric intracorneal ring segment with variable thickness and base width: a 2d finite-element model.
publisher Public Library of Science (PLoS)
publishDate 2021
url https://doaj.org/article/42695fea696e417eba95dac9cc6f81fd
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AT rafaelibarraquer refractivechangesofanewasymmetricintracornealringsegmentwithvariablethicknessandbasewidtha2dfiniteelementmodel
AT sabinekling refractivechangesofanewasymmetricintracornealringsegmentwithvariablethicknessandbasewidtha2dfiniteelementmodel
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