Stress free configuration of the human eye

Ahmed Elsheikh, Charles Whitford, Rosti Readioff, Wael Kassem, Akram Joda, Philippe Büchler

Research output: Contribution to journalArticlepeer-review

50 Citations (SciVal)


Numerical simulations of eye globes often rely on topographies that have been measured in vivo using devices such as the Pentacam or OCT. The topographies, which represent the form of the already stressed eye under the existing intraocular pressure, introduce approximations in the analysis. The accuracy of the simulations could be improved if either the stress state of the eye under the effect of intraocular pressure is determined, or the stress-free form of the eye estimated prior to conducting the analysis. This study reviews earlier attempts to address this problem and assesses the performance of an iterative technique proposed by Pandolfi and Holzapfel [1], which is both simple to implement and promises high accuracy in estimating the eye's stress-free form. A parametric study has been conducted and demonstrated reliance of the error level on the level of flexibility of the eye model, especially in the cornea region. However, in all cases considered 3–4 analysis iterations were sufficient to produce a stress-free form with average errors in node location
Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalMedical Engineering & Physics
Issue number2
Early online date4 Oct 2012
Publication statusPublished - 28 Feb 2013
Externally publishedYes


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