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Optic disk morphometry in high myopia.

J B Jonas1, G C Gusek, G O Naumann

  • 1Augenklinik mit Poliklinik, Universität Erlangen-Nürnberg, Federal Republic of Germany.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|January 1, 1988
PubMed
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Highly myopic optic nerve heads are larger and more oval than normal. Their size correlates with refractive error and possibly age, distinguishing them from other acquired macrodisks.

Area of Science:

  • Ophthalmology
  • Optometry
  • Medical Imaging

Background:

  • Optic nerve head morphology differs significantly in highly myopic eyes compared to normal eyes.
  • High myopia (refraction > -8.00 diopters) presents unique structural characteristics.
  • Understanding these differences is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To perform magnification-corrected morphometry of optic nerve heads in highly myopic individuals.
  • To compare the size and shape of optic disks in high myopia versus normal eyes.
  • To investigate correlations between refractive error, optic disk size, and parapapillary changes.

Main Methods:

  • Magnification-corrected morphometry was applied to photographs of 51 highly myopic optic nerve heads.

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  • Comparison was made with 457 unselected normal optic nerve heads.
  • Statistical analysis (Wilcoxon-Mann-Whitney test) was used to assess significance.

    • Main Results:

    • Highly myopic optic disks were significantly larger and more oval than normal disks (P < 0.000001).
    • Refraction, disk size, and parapapillary atrophy area were significantly correlated (P < 0.00001).
    • Parapapillary vessel diameter was independent of disk size.

    Conclusions:

    • Highly myopic optic disks can be classified as secondary acquired macrodisks.
    • Disk size is correlated with refractive error and potentially age.
    • Differentiating these from congenital or primary macrodisks is important.