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Indentation of the cornea: A Bi-layer contact problem
M V Swain1, N Schroeter2, J Nohava3
1AMME, Biomechanics Engineering, The University of Sydney, Sydney, NSW, 2004, Australia; Biomechanics Lab, Don State Technical University, Rostov-on-Don, 344010, Russia.
Journal of the Mechanical Behavior of Biomedical Materials
|March 25, 2021
Summary
This study models corneal indentation, revealing its complex mechanical response beyond simple elasticity. The findings highlight the distinct roles of the Bowman's layer and stroma in the cornea's biomechanics.
Area of Science:
- Ophthalmology
- Biomaterials Science
- Biomechanics
Background:
- The cornea's layered structure influences its mechanical properties.
- Previous indentation studies have not fully addressed the role of individual corneal layers or fluid dynamics.
Purpose of the Study:
- To investigate the corneal indentation response considering its multi-layered structure and fluid content.
- To develop a model accounting for the poro-elastic interaction between the Bowman's layer and stroma.
Main Methods:
- Spherical indentation with a 500 μm radius indenter was applied to the cornea.
- A poro-elastic bi-layer contact model was developed, treating the cornea as a stiffer Bowman's layer over a less stiff stroma.
Main Results:
- The initial loading phase did not conform to a classic Hertz elastic model.
- An initial steeper slope was observed, declining gradually with increased force and displacement, indicating complex material behavior.
Conclusions:
- The cornea's indentation response is influenced by its distinct layers and fluid content.
- A poro-elastic bi-layer model provides a more accurate representation of corneal biomechanics during indentation than simple elastic models.
Keywords:
Bi-layerBowman's layerCorneaElastic modulusHydraulic conductivityIndentationPoro-elasticStromaMore Related Videos
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