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Related Experiment Video

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The Mechanical Interpretation of Ocular Response Analyzer Parameters.

Xiao Qin1,2, Mengyao Yu1,2, Haixia Zhang1,2

  • 1Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, China.

Biomed Research International
|August 6, 2019
PubMed
Summary

This study explores the mechanical interpretation of Ocular Response Analyzer (ORA) parameters. Corneal elastic properties are reflected in ORA parameters like Corneal Hysteresis (CH) and Corneal Resistance Factor (CRF), validated through biomechanical tests and simulations.

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Area of Science:

  • Ophthalmology
  • Biomechanical Engineering
  • Corneal Biomechanics

Background:

  • The Ocular Response Analyzer (ORA) is a widely used clinical device.
  • Complete mechanical interpretations of ORA-derived parameters remain elusive.

Purpose of the Study:

  • To investigate the mechanical interpretation of parameters obtained from the Ocular Response Analyzer (ORA).

Main Methods:

  • In vivo ORA measurements and ex vivo corneal strip uniaxial tensile tests were performed on rabbits.
  • Correlations between ORA parameters and corneal biomechanical properties (elastic modulus, relaxation time, relaxation limit) were analyzed.
  • Finite element method simulations were employed to further elucidate quantitative relationships.

Main Results:

  • Corneal Resistance Factor (CRF) showed significant correlation with corneal elastic modulus and relaxation limit.
  • Corneal Hysteresis (CH) and CRF demonstrated significant correlations with elastic modulus, relaxation limit, and relaxation time in finite element analysis.
  • Corneal elastic modulus was positively correlated with upslope parameters and negatively with width (w2).

Conclusions:

  • ORA parameters including CH, CRF, upslope, and peak width may indicate corneal elastic properties.
  • Combining ORA data with biomechanical tests and finite element simulations offers a viable approach to understanding ORA parameter mechanics.
  • Further research is recommended to validate these mechanical interpretations.