Localized refractive changes induced by symmetric and progressive asymmetric intracorneal ring segments assessed with a 3D finite-element model
Author
García de Oteyza, Gonzalo
Álvarez de Toledo, Juan
Barraquer, Rafael I.
Kling, Sabine
Publication date
2023ISSN
2306-5354
Abstract
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.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
617 - Surgery. Orthopaedics. Ophthalmology
Keywords
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
Pages
12
Publisher
MDPI
Collection
10; 9
Is part of
Bioengineering
Citation
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
This item appears in the following Collection(s)
- Ciències de la Salut [738]
Rights
© 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/).
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by/4.0/