Comparative study of corneal strip extensometry and inflation tests

Ahmed Elsheikh, Kevin Anderson

    Research output: Contribution to journalArticlepeer-review

    179 Citations (Scopus)


    Strip extensometry tests are usually considered less reliable than trephinate inflation tests in studying corneal biomechanics. In spite of the evident simplicity of strip extensometry tests, several earlier studies preferred inflation tests in determining the constitutive relationship of the cornea and its other material properties, such as Young's modulus and the hysteresis behaviour. In this research, the deficiencies of the strip tests are discussed and a mathematical procedure presented to take account of these deficiencies when obtaining the corneal material properties. The study also involves testing 10 pairs of porcine corneas using both strip extensometry and trephinate inflation techniques and the results are subjected to mathematical back analysis in order to determine the stress–strain behaviour. The behaviour obtained from the strip extensometry tests and using the new mathematical analysis procedure is shown to match closely the inflation test results.
    Original languageEnglish
    Pages (from-to)177-185
    Number of pages9
    JournalJournal of the Royal Society. Interface
    Issue number3
    Publication statusPublished - 2005


    • Corneal biomechanics
    • Strip extensometry
    • Trephinate inflation


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