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The optic nerve head as a robust biomechanical system.

Ian A Sigal1, Richard A Bilonick, Larry Kagemann

  • 1Department of Ophthalmology, UPMC Eye Center, Eye and Ear Institute, Ophthalmology and Visual Science Research Center, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA. sigalia@upmc.edu

Investigative Ophthalmology & Visual Science
|March 20, 2012
PubMed
Summary

The optic nerve head (ONH) is a robust structure, showing stable responses to intraocular pressure (IOP) despite variations in geometry and mechanical properties. This research provides typical mechanical responses for the ONH to IOP changes.

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Area of Science:

  • Ophthalmology
  • Biomechanics
  • Computational modeling

Background:

  • Understanding the optic nerve head's (ONH) response to intraocular pressure (IOP) is crucial for glaucoma research.
  • The ONH's biomechanical stability under varying IOP is not fully understood.

Purpose of the Study:

  • To test the hypothesis that the ONH is a robust biomechanical structure.
  • To analyze the ONH's response to a controlled increase in IOP.

Main Methods:

  • Generated 200,000 numerical ONH models with varied geometric and mechanical properties.
  • Simulated a 10 mm Hg IOP increase to predict lamina cribrosa displacement (LCD) and scleral canal expansion (SCE).
  • Analyzed distributions of biomechanical responses, including stresses and strains.

Main Results:

  • ONH responses to IOP were nonuniformly distributed, with most models showing concentrated responses.
  • Gaussian distribution models exhibited more concentrated responses than uniform ones.
  • All responses were positively skewed, indicating common typical responses.

Conclusions:

  • The ONH is a robust structure, tolerating variations in tissue properties for stable LCD and SCE.
  • Despite individual variability, typical mechanical responses of the ONH to IOP fluctuations exist.
  • This study offers the first population-based estimates of ONH mechanical responses to IOP variations.