Characterisation and Modelling of an Artificial Lens Capsule Mimicking Accommodation of Human Eyes

Huidong Wei; James S. Wolffsohn; Otavio Gomes de Oliveria; Leon N Davies

doi:10.3390/polym13223916

Characterisation and Modelling of an Artificial Lens Capsule Mimicking Accommodation of Human Eyes

Huidong Wei^*, James S. Wolffsohn^*, Otavio Gomes de Oliveria, Leon N Davies

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

A synthetic material of silicone rubber was used to construct an artificial lens capsule (ALC) in order to replicate the biomechanical behaviour of human lens capsule. The silicone rubber was characterised by monotonic and cyclic mechanical tests to reveal its hyper-elastic behaviour under uniaxial tension and simple shear as well as the rate independence. A hyper-elastic constitutive model was calibrated by the testing data and incorporated into finite element analysis (FEA). An experimental setup to simulate eye focusing (accommodation) of ALC was performed to validate the FEA model by evaluating the shape change and reaction force. The characterisation and modelling approach provided an insight into the intrinsic behaviour of materials, addressing the inflating pressure and effective stretch of ALC under the focusing process. The proposed methodology offers a virtual testing environment mimicking human capsules for the variability of dimension and stiffness, which will facilitate the verification of new ophthalmic prototype such as accommodating intraocular lenses (AIOLs).

Original language	English
Article number	3916
Number of pages	16
Journal	Polymers
Volume	13
Issue number	22
DOIs	https://doi.org/10.3390/polym13223916
Publication status	Published - 12 Nov 2021

Bibliographical note

© 2021 by the authors. Li‐
censee MDPI, Basel, Switzerland.
This article is an open access article
distributed under the terms and con‐
ditions of the Creative Commons At‐
tribution (CC BY) license (https://cre‐
ativecommons.org/licenses/by/4.0/).

Funding: This research was funded by INNOVATE UK under the Knowledge Transfer Partnership
Project between Aston University and Rayner Intraocular Lenses Limited, grant number 11718.
L.N.D. was funded, in part, by a research grant (27616) from the College of Optometrists, UK.

Keywords

Biomechanical
Constitutive model
FEA
Hyper-elastic
Silicone rubber

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10.3390/polym13223916Licence: CC BY 3.0

Characterisation and Modelling of an Artificial Lens Capsule
© 2021 by the authors. Li‐ censee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and con‐ ditions of the Creative Commons At‐ tribution (CC BY) license (https://cre‐ ativecommons.org/licenses/by/4.0/).
Final published version, 2.59 MBLicence: CC BY 3.0

Cite this

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title = "Characterisation and Modelling of an Artificial Lens Capsule Mimicking Accommodation of Human Eyes",

abstract = "A synthetic material of silicone rubber was used to construct an artificial lens capsule (ALC) in order to replicate the biomechanical behaviour of human lens capsule. The silicone rubber was characterised by monotonic and cyclic mechanical tests to reveal its hyper-elastic behaviour under uniaxial tension and simple shear as well as the rate independence. A hyper-elastic constitutive model was calibrated by the testing data and incorporated into finite element analysis (FEA). An experimental setup to simulate eye focusing (accommodation) of ALC was performed to validate the FEA model by evaluating the shape change and reaction force. The characterisation and modelling approach provided an insight into the intrinsic behaviour of materials, addressing the inflating pressure and effective stretch of ALC under the focusing process. The proposed methodology offers a virtual testing environment mimicking human capsules for the variability of dimension and stiffness, which will facilitate the verification of new ophthalmic prototype such as accommodating intraocular lenses (AIOLs).",

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Characterisation and Modelling of an Artificial Lens Capsule Mimicking Accommodation of Human Eyes

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Keywords

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