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Related Experiment Videos

Histomorphometry of the human optic nerve.

J B Jonas1, J A Müller-Bergh, U M Schlötzer-Schrehardt

  • 1Department of Ophthalmology, University of Erlangen-Nürnberg, West Germany.

Investigative Ophthalmology & Visual Science
|April 1, 1990
PubMed
Summary

Normal human optic nerves have over a million nerve fibers, decreasing with age. This nerve fiber loss and variability impact vision and optic nerve disease progression.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Histomorphometry

Background:

  • The human optic nerve's structure is crucial for vision.
  • Understanding normal nerve fiber parameters is essential for diagnosing optic nerve diseases.

Purpose of the Study:

  • To histomorphometrically analyze the number, diameter, and distribution of nerve fibers in normal human optic nerves.
  • To investigate age-related changes and regional variations in optic nerve fiber characteristics.

Main Methods:

  • Histomorphometric examination of 22 human optic nerves from 19 subjects (20-75 years old).
  • Analysis of semithin sections at 2-5 mm posterior to the globe.
  • Measurement of nerve fiber count, diameter, and optic nerve cross-sectional area.

Main Results:

  • Mean nerve fiber count was 1,159,000 ± 196,000, with an average age-related loss of 5426 fibers/year.
  • Mean minimal nerve fiber diameter was 1.00 ± 0.06 microns; smaller in temporal/inner regions.
  • Optic nerve cross-sectional area correlated positively with nerve fiber count.

Conclusions:

  • Significant interindividual variability in nerve fiber count exists, potentially affecting psychophysical test comparisons.
  • Age-dependent nerve fiber loss may contribute to reduced visual performance in older adults.
  • Variability in nerve fiber size may reflect different retinal ganglion cell populations and impacts optic nerve disease assessment.

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