Assessment of corneal and fatty tissues biomechanical response in dynamic tonometry tests by using inverse models

• Autorzy: Jannesari M. , Kadkhodaei M. , Mosaddegh P. , Kasprzak H. , Behrouz M. J.

Identyfikatory

DOI

10.5277/ABB-00969-2017-02

• Języki publikacji: EN

Abstrakty

EN

The assessment of corneal biomechanics is essential for studying ophthalmological operations, such as refractive surgeries, and for more accurate estimation of intraocular pressure. The chief aim of the current study is to characterize corneal and fatty tissues in order to construct a model to predict eye globe behavior during dynamic tonometry tests. Methods: In the present study, images from corneal deformation, acquired from Corvis ST tonometer, were processed. Then, corneal pure displacement and eye globe retraction were calculated. Utilizing inverse finite element method, corneal material properties were calculated in order to predict pure deformation obtained from Corvis ST. Using a similar approach, material parameters of fatty tissue were estimated in order to predict the eye globe retraction. The model used for fatty tissue was considered as corneal boundary condition in a forward finite element model to create a joint model, which could simulate corneal behavior in dynamic tonometry tests. Results: It was shown that an isotropic material model is accurate enough to predict corneal deformation in dynamic tonometry tests. Moreover, effects of IOP on the estimated material properties were investigated. Finally, utilizing the joint model, it was demonstrated that there is strong correlation between corneal stiffness and the biomechanical parameter introduced by Corvis ST. Conclusions: An eye globe model was constructed and characterized by two distinct inverse models for corneal and fatty tissue. This model can be utilized for predicting eye globe behavior during dynamic tonometry tests besides other ophthalmological operations.

Słowa kluczowe

EN

corneal biomechanics; fatty tissue; dynamic tonometry; inverse finite element method

PL

biomechanika rogówki; okulistyka; tkanka tłuszczowa; tonometria

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2018
• Tom: Vol. 20, no. 1
• Strony: 39--48
• Opis fizyczny: Bibliogr. 26 poz., rys., tab., wykr.

Twórcy

autor

Jannesari M.

• Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran

autor

Kadkhodaei M.

• Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran

autor

Mosaddegh P.

• Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
• Visiting Scholar, Computer Vision Laboratory, Institut für Bildverarbeitung, Department of Information Technology and Electrical Engineering, Swiss Federal Institute of Technology Zürich, Zürich, Switzerland

autor

Kasprzak H.

• Faculty of Principal Problems of Technology, Wrocław University of Science and Technology, Wrocław, Poland

autor

Behrouz M. J.

• Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).