The vibration characteristics of shell structures such as eyes have been shown to vary with intraocular pressure (IOP). Therefore, vibration characteristics of the eye have the potential to provide improved correlation to IOP over traditional IOP measurements. As background to examine an improved IOP correlation, this paper develops a finite element model of an eye subject to vibration. The eye is modeled as a shell structure filled with inviscid pressurized fluid in which there is no mean flow. This model solves a problem of a fluid with coupled structural interactions of a generally spherically shaped shell system. The model is verified by comparing its vibrational characteristics with an experimental modal analysis of an elastic spherical shell filled with water. The structural dynamic effects due to change in pressure of the fluid are examined. It is shown that the frequency response of this fluid-solid coupled system has a clear increase in natural frequency as the fluid pressure rises. The fluid and structure interaction is important for accurate prediction of system dynamics. This model is then extended to improve its accuracy in modeling the eye by including the effect of the lens to study corneal vibration. The effect of biomechanical parameters such as the thicknesses of different parts of the eye and eye dimensions in altering measured natural frequencies is investigated and compared to the influence of biomechanical parameters in Goldmann applanation tonometry models. The dynamic response of the eye is found to be less sensitive to biomechanical parameters than the applanation tonometry model.
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e-mail: tfreihei@ucalgary.ca
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September 2011
Research Papers
Dynamic Response of Intraocular Pressure and Biomechanical Effects of the Eye Considering Fluid-Structure Interaction
S. Salimi,
S. Salimi
Department of Mechanical and Manufacturing Engineering,
University of Calgary
, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
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S. Simon Park,
S. Simon Park
Department of Mechanical and Manufacturing Engineering,
University of Calgary
, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
Search for other works by this author on:
T. Freiheit
T. Freiheit
Department of Mechanical and Manufacturing Engineering,
e-mail: tfreihei@ucalgary.ca
University of Calgary
, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
Search for other works by this author on:
S. Salimi
Department of Mechanical and Manufacturing Engineering,
University of Calgary
, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
S. Simon Park
Department of Mechanical and Manufacturing Engineering,
University of Calgary
, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
T. Freiheit
Department of Mechanical and Manufacturing Engineering,
University of Calgary
, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
e-mail: tfreihei@ucalgary.ca
J Biomech Eng. Sep 2011, 133(9): 091009 (11 pages)
Published Online: October 14, 2011
Article history
Received:
August 11, 2010
Revised:
September 19, 2011
Published:
October 14, 2011
Citation
Salimi , S., Simon Park, S., and Freiheit, T. (October 14, 2011). "Dynamic Response of Intraocular Pressure and Biomechanical Effects of the Eye Considering Fluid-Structure Interaction." ASME. J Biomech Eng. September 2011; 133(9): 091009. https://doi.org/10.1115/1.4005166
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