Localized refractive changes induced by symmetric and progressive asymmetric intracorneal ring segments assessed with a 3D finite-element model
Autor/a
García de Oteyza, Gonzalo
Álvarez de Toledo, Juan
Barraquer, Rafael I.
Kling, Sabine
Data de publicació
2023ISSN
2306-5354
Resum
To build a representative 3D finite element model (FEM) for intracorneal ring segment (ICRS) implantation and to investigate localized optical changes induced by different ICRS geometries, a hyperelastic shell FEM was developed to compare the effect of symmetric and progressive asymmetric ICRS designs in a generic healthy and asymmetric keratoconic (KC) cornea. The resulting deformed geometry was assessed in terms of average curvature via a biconic fit, sagittal curvature (K), and optical aberrations via Zernike polynomials. The sagittal curvature map showed a locally restricted flattening interior to the ring (Kmax −11 to −25 dpt) and, in the KC cornea, an additional local steepening on the opposite half of the cornea (Kmax up to +1.9 dpt). Considering the optical aberrations present in the model of the KC cornea, the progressive ICRS corrected vertical coma (−3.42 vs. −3.13 µm); horizontal coma (−0.67 vs. 0.36 µm); and defocus (2.90 vs. 2.75 µm), oblique trefoil (−0.54 vs. −0.08 µm), and oblique secondary astigmatism (0.48 vs. −0.09 µm) aberrations stronger than the symmetric ICRS. Customized ICRS designs inspired by the underlying KC phenotype have the potential to achieve more tailored refractive corrections, particularly in asymmetric keratoconus patterns.
Tipus de document
Article
Versió del document
Versió publicada
Llengua
English
Matèries (CDU)
617 - Cirurgia. Ortopèdia. Oftalmologia
Paraules clau
Model d'elements finits
Queratocon
Cirurgia refractiva
Biomecànica corneal
Elastografia
Model 3D
Modelo de elementos finitos
Queratocono
Cirugía refractiva
Biomecánica corneal
Elastografía
Modelo 3D
Finite element model
Keratoconus
Refractive surgery
Corneal biomechanics
Elastography
3D model
Pàgines
12
Publicat per
MDPI
Col·lecció
10; 9
Publicat a
Bioengineering
Citació
García de Oteyza, Gonzalo; Álvarez de Toledo, Juan; Barraquer, Rafael I. [et al.]. Localized refractive changes induced by symmetric and progressive asymmetric intracorneal ring segments assessed with a 3D finite-element model. Bioengineering, 2023, 10(9), 1014. Disponible en: <https://www.mdpi.com/2306-5354/10/9/1014>. Fecha de acceso: 14 feb. 2024. DOI: 10.3390/bioengineering10091014
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Drets
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Excepte que s'indiqui una altra cosa, la llicència de l'ítem es descriu com https://creativecommons.org/licenses/by/4.0/