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Related Experiment Videos

Pressure-dependent changes of the optic disk in primary open-angle glaucoma

J B Jonas1, K I Papastathopoulos

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

American Journal of Ophthalmology
|March 1, 1995
PubMed
Summary

Glaucoma optic disk changes related to intraocular pressure (IOP) were studied. Higher IOP correlated with neuroretinal rim area and visual field defects, but not parapapillary atrophy, suggesting pressure independence for atrophy.

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Area of Science:

  • Ophthalmology
  • Glaucoma Research

Background:

  • Glaucomatous optic neuropathy is a leading cause of irreversible blindness.
  • Differentiating pressure-dependent from pressure-independent optic disk changes is crucial for glaucoma management.

Purpose of the Study:

  • To distinguish optic disk alterations caused by elevated intraocular pressure (IOP) from those that are pressure-independent in primary open-angle glaucoma (POAG).

Main Methods:

  • Morphometric analysis of the optic disk was conducted.
  • 24-hour intraocular pressure (IOP) profiles were measured.
  • Intraindividual bilateral comparisons were performed for 357 POAG patients.

Main Results:

  • Differences in maximal IOP between fellow eyes significantly correlated with differences in neuroretinal rim area and mean perimetric defect.

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  • No significant correlations were found between IOP differences and parapapillary atrophy.

    • Conclusions:

    • Parapapillary atrophy appears less dependent, or independent, of IOP compared to neuroretinal rim area and visual field defects.
    • This suggests distinct pathophysiological mechanisms for different optic disk changes in glaucoma.