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3D morphometry of the human optic nerve head.

Ian A Sigal1, John G Flanagan, Inka Tertinegg

  • 1Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON, Canada. ian.sigal@gmail.com

Experimental Eye Research
|September 24, 2009
PubMed
Summary

Human optic nerve head (ONH) anatomy shows significant individual variation. Morphometric analysis reveals that differences between fellow eyes often exceed those caused by intraocular pressure (IOP) changes.

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Area of Science:

  • Ophthalmology
  • Anatomy
  • Biomedical Engineering

Background:

  • Human optic nerve head (ONH) anatomy is crucial for understanding glaucoma.
  • Previous studies lacked detailed 3D morphometric analysis of the ONH.

Purpose of the Study:

  • To conduct a 3D morphometric study of human ONH anatomy using histologic reconstructions.
  • To quantify ONH structural parameters and assess variability.

Main Methods:

  • Reconstruction of 10 human ONHs from histologic sections into 3D models.
  • Measurement of lamina cribrosa (LC) thickness, scleral canal diameter, and other morphometric parameters.
  • Comparison of ONH morphology between eyes fixed at different intraocular pressures (IOPs).

Main Results:

  • Significant inter-individual variability in ONH morphology was observed, exceeding changes due to acute IOP variations.
  • The lamina cribrosa (LC) inserts into the pia mater, not solely the sclera.
  • Scleral tissue obscures approximately one-third of the anterior LC surface, limiting imaging techniques.

Conclusions:

  • 3D reconstruction of human ONH anatomy is feasible, but large anatomical variations complicate morphometric analysis.
  • The pia mater's insertion into the LC may have biomechanical implications requiring further investigation.
  • Clinical imaging of the LC is limited to central and mid-peripheral regions due to scleral occlusion.