Ocular tissue properties have been widely studied in tension and compression for humans and a variety of animals. However, direct shear testing of the tissues of the sclera appear to be absent from the literature even though modeling, analyses, and anatomical studies have indicated that shear may play a role in the etiology of primary open angle glaucoma (POAG). In this work, the mechanical behavior of bovine scleral tissue in shear has been studied in both out-of-plane and in-plane modes of deformation. Stress–strain and relaxation tests were conducted on tissue specimens at controlled temperature and hydration focusing on trends related to specimen location and orientation. There was generally found to be no significant effect of specimen orientation and angular location in the globe on shear stiffness in both modes. The in-plane response, which is the primary load carrying mode, was found to be substantially stiffer than the out-of-plane mode. Also, within the in-plane studies, tissue further from the optic nerve was stiffer than the near tissue. The viscosity coefficient of the tissue varied insignificantly with distance from the optic nerve, but overall was much higher in-plane than out-of-plane.
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July 2014
Research-Article
Shear Behavior of Bovine Scleral Tissue
Alan Argento,
Alan Argento
1
Professor
Department of Mechanical Engineering,
e-mail: aargento@umich.edu
Department of Mechanical Engineering,
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: aargento@umich.edu
1Corresponding author.
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Wonsuk Kim,
Wonsuk Kim
Department of Mechanical Engineering,
e-mail: wskim@umich.edu
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: wskim@umich.edu
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Frank W. Rozsa,
Frank W. Rozsa
Department of Ophthalmology and
Visual Sciences,
Kellogg Eye Center,
e-mail: rozsa@med.umich.edu
Visual Sciences,
Kellogg Eye Center,
University of Michigan
,Ann Arbor, MI 48105
e-mail: rozsa@med.umich.edu
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Kori L. DeBolt,
Kori L. DeBolt
Department of Mechanical Engineering,
e-mail: deboltk@mail.gvsu.edu
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: deboltk@mail.gvsu.edu
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Sophia Zikanova,
Sophia Zikanova
Department of Mechanical Engineering,
e-mail: szikanova@gmail.com
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: szikanova@gmail.com
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Julia R. Richards
Julia R. Richards
Professor
Department of Ophthalmology and
Visual Sciences,
Kellogg Eye Center,
e-mail: richj@med.umich.edu
Department of Ophthalmology and
Visual Sciences,
Kellogg Eye Center,
University of Michigan
,Ann Arbor, MI 48105
e-mail: richj@med.umich.edu
Search for other works by this author on:
Alan Argento
Professor
Department of Mechanical Engineering,
e-mail: aargento@umich.edu
Department of Mechanical Engineering,
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: aargento@umich.edu
Wonsuk Kim
Department of Mechanical Engineering,
e-mail: wskim@umich.edu
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: wskim@umich.edu
Frank W. Rozsa
Department of Ophthalmology and
Visual Sciences,
Kellogg Eye Center,
e-mail: rozsa@med.umich.edu
Visual Sciences,
Kellogg Eye Center,
University of Michigan
,Ann Arbor, MI 48105
e-mail: rozsa@med.umich.edu
Kori L. DeBolt
Department of Mechanical Engineering,
e-mail: deboltk@mail.gvsu.edu
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: deboltk@mail.gvsu.edu
Sophia Zikanova
Department of Mechanical Engineering,
e-mail: szikanova@gmail.com
The University of Michigan-Dearborn
,4901 Evergreen Road
,Dearborn, MI 48128
e-mail: szikanova@gmail.com
Julia R. Richards
Professor
Department of Ophthalmology and
Visual Sciences,
Kellogg Eye Center,
e-mail: richj@med.umich.edu
Department of Ophthalmology and
Visual Sciences,
Kellogg Eye Center,
University of Michigan
,Ann Arbor, MI 48105
e-mail: richj@med.umich.edu
1Corresponding author.
Manuscript received December 21, 2013; final manuscript received April 24, 2014; accepted manuscript posted May 8, 2014; published online May 22, 2014. Assoc. Editor: Jonathan Vande Geest.
J Biomech Eng. Jul 2014, 136(7): 071011 (12 pages)
Published Online: May 22, 2014
Article history
Received:
December 21, 2013
Revision Received:
April 24, 2014
Accepted:
May 8, 2014
Citation
Argento, A., Kim, W., Rozsa, F. W., DeBolt, K. L., Zikanova, S., and Richards, J. R. (May 22, 2014). "Shear Behavior of Bovine Scleral Tissue." ASME. J Biomech Eng. July 2014; 136(7): 071011. https://doi.org/10.1115/1.4027615
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