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TECHNICAL PAPERS: Soft Tissue

Viscoelastic Characterization of Peripapillary Sclera: Material Properties by Quadrant in Rabbit and Monkey Eyes

[+] Author and Article Information
J. Crawford Downs, J-K. Francis Suh, Anthony J. Bellezza, Richard T. Hart

Department of Biomedical Engineering, Tulane University, Lindy Boggs Center, Suite 500, New Orleans, LA 70118

Kevin A. Thomas

Department of Orthopaedics, Louisiana State University Health Sciences Center, 2025 Gravier Street, Suite 400, New Orleans, LA 70112

Claude F. Burgoyne

Department of Biomedical Engineering, Tulane University, Lindy Boggs Center, Suite 500, New Orleans, LA 70118, and LSU Eye Center, Louisiana State University, Health Sciences Center, 2020 Gravier Street, Suite B, New Orleans, LA 70112

J Biomech Eng 125(1), 124-131 (Feb 14, 2003) (8 pages) doi:10.1115/1.1536930 History: Received November 01, 2001; Revised September 01, 2002; Online February 14, 2003
Copyright © 2003 by ASME
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Figures

Grahic Jump Location
(A) Diagram of the anatomy of the eye, showing the location of the scleral canal and ONH; (B) histologic sagittal section through the scleral canal and ONH showing the peripapillary sclera, lamina cribrosa, and retinal ganglion cell axons, and (C) histologic transverse section through the scleral canal and ONH showing the connective tissue structure of the scleral canal, lamina cribrosa, and central retinal vessels.
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(A) Diagram of the posterior view of a scleral shell showing the orientation of a scleral tensile specimen from the inferior quadrant (similar specimens were generated in the superior, nasal, and temporal quadrants); (B) photograph of the tensile specimen cutting die, and (C) photograph of the scleral shell holding ball.
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(A) Photograph of the testing environment chamber, and (B) a close-up photograph (inside the testing environment chamber) showing a dummy specimen mounted in the grips and in contact with the extensometer arms.
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Diagram of the time course of the three-stage uniaxial tensile testing protocol applied to the monkey scleral specimens.
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Mean stress-strain curves for peripapillary rabbit sclera from the superior, inferior, nasal, and temporal quadrants tested in uniaxial tension at a strain rate of 1 percent/s (95 percent confidence bars).
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Mean stress-strain curves for peripapillary monkey sclera from the superior, inferior, nasal, and temporal quadrants tested in uniaxial tension at a strain rate of 1 percent/s (95 percent confidence bars).
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Mean stress relaxation responses of rabbit and monkey peripapillary sclera (all quadrants combined). For a statistical comparison of the parameters used to generate these curves, see overall data in Tables 1 and 2.

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