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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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Structural factors that mediate scleral stiffness.

David S Schultz1, Jeffrey C Lotz, Shira M Lee

  • 1Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94143-0730, USA.

Investigative Ophthalmology & Visual Science
|June 10, 2008
PubMed
Summary

Aged human sclera is stiffer than porcine sclera due to increased nonenzymatic cross-links, despite lower collagen. Both tissues absorb similar strain energy, indicating complex biomechanical relationships.

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Area of Science:

  • Ophthalmology
  • Biomechanical Engineering
  • Materials Science

Background:

  • The sclera's biomechanical properties are crucial for ocular integrity.
  • Understanding scleral tissue composition and mechanical behavior is vital for diagnosing and treating eye diseases.

Purpose of the Study:

  • To correlate biochemical constituents with tensile mechanical behavior in porcine and human posterior sclera.
  • To investigate the role of collagen, cross-links, elastin, glycosaminoglycans, and water content in scleral mechanics.

Main Methods:

  • Posterior scleral strips from porcine and aged human eyes were tested for mechanical hysteresis.
  • Biochemical assays were performed to quantify collagen, nonenzymatic cross-links, elastin, glycosaminoglycans, and water content.

Main Results:

  • Human sclera exhibited significantly higher stiffness (modulus) than porcine sclera.
  • Despite lower collagen content, aged human sclera showed higher nonenzymatic cross-link density.
  • Strain energy absorption was similar between porcine and human sclera.

Conclusions:

  • Accumulation of nonenzymatic cross-links contributes to the superior mechanical stiffness of aged human sclera.
  • Collagen content and cross-link density have complex, potentially offsetting effects on strain energy absorption in scleral tissues.