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Related Experiment Videos

The normalised rim/disc area ratio line

K U Bartz-Schmidt1, C P Jonescu-Cuypers, G Thumann

  • 1Department of Ophthalmology, University of Cologne, Germany.

International Ophthalmology
|January 1, 1995
PubMed
Summary
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A new method normalizes the rim/disc area ratio for optic discs, aiding in distinguishing glaucoma. This helps accurately assess optic nerve head damage by considering individual disc size.

Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Optic disc assessment for glaucoma relies on criteria like disc area.
  • A small cup in a small optic disc may indicate advanced glaucoma.
  • A large cup in a large optic disc can be normal, complicating diagnosis.

Purpose of the Study:

  • To calculate and evaluate a normalized rim/disc area ratio line.
  • To improve the distinction between glaucomatous and normal optic cups.
  • To present a new display mode for Heidelberg Retina Tomograph (HRT) examinations.

Main Methods:

  • Evaluated Heidelberg Retina Tomograph (HRT) scans of 100 normal subjects' optic nerve heads.
  • Calculated the disc area-adjusted rim/disc area ratio in 10-degree sectors.

Related Experiment Videos

  • Determined the 50th and 95th percentiles for each sector.

    • Main Results:

    • Developed an individual normalized rim/disc area ratio line based on normal percentile curves.
    • Demonstrated the display of this line on topographic images.
    • Showcased its application in differentiating normal, moderate, advanced, and glaucomatous optic discs.

    Conclusions:

    • The normalized rim/disc area ratio line aids in reliable glaucoma assessment.
    • This new display mode simplifies the interpretation of HRT optic nerve head examinations.
    • It offers an easy and reliable method for assessing glaucomatous optic nerve head damage from topographic images.