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Proper Material Properties Are Required for the Finite Element Method
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The finite element method is now widely used in all areas of medicine and dentistry. We are pleased to see that Stitzel et al1 used the finite element method to analyze the effects of blunt trauma to the eye. Stitzel and colleagues found that lens stiffness is a critical parameter in the eye's response to blunt injury. However, the proper choice of baseline material properties is essential for the finite element method to reliably predict this or any other outcome.
We are concerned with the accuracy of the baseline data used by Stitzel and colleagues in determining the lenticular elastic modulus. The elastic modulus is a measure of stiffness that is calculated as shown in the following formula:
Stitzel and colleagues obtained an elastic modulus of 6.89 MPa for the group of patients aged 66 years or older from force displacement measurements of cataractous lens nuclei in vitro.2-3 We are . . . [Full Text of this Article]
AUTHOR INFORMATION
Ronald A. Schachar, MD, PhD;
Ali Abolmaali, PhD
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RELATED LETTER
Proper Material Properties Are Required for the Finite Element Method—Reply
Joel Stitzel and Stefan Duma
Arch Ophthalmol. 2006;124(7):1065-1066.
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RELATED ARTICLE
Blunt Trauma of the Aging Eye: Injury Mechanisms and Increasing Lens Stiffness
Joel D. Stitzel, Gail A. Hansen, Ian P. Herring, and Stefan M. Duma
Arch Ophthalmol. 2005;123(6):789-794.
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