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Novel Heidelberg retina tomograph-based morphological parameters derived from optic disc cupping surface processing.

Vassilis Kilintzis1, Theofanis Pappas, Ioanna Chouvarda

  • 1Department of Ophthalmology, School of Medicine, Aristotle University of Thessaloniki, AHEPA Hospital, Thessaloniki, Greece.

Investigative Ophthalmology & Visual Science
|November 6, 2010
PubMed
Summary

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New optic nerve head features, including contour length and shape deviation, effectively distinguish glaucoma patients from healthy individuals. These parameters offer improved diagnostic accuracy for primary open-angle glaucoma (POAG).

Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Glaucoma diagnosis relies on optic nerve head (ONH) assessment.
  • Heidelberg Retina Tomograph (HRT) provides quantitative ONH morphology data.
  • Novel parameters may enhance diagnostic capabilities for glaucoma.

Purpose of the Study:

  • To identify new optic nerve head (ONH) morphology features using Heidelberg Retina Tomograph (HRT).
  • To evaluate the ability of these novel features to differentiate between glaucomatous and normal subjects.
  • To assess the diagnostic power of explored parameters in primary open-angle glaucoma (POAG).

Main Methods:

  • Analyzed HRT TIFF images from 97 normal subjects and 97 POAG patients.
  • Transformed optic disc cupping surface contours into data series.

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  • Examined novel parameters: contour length (LC), SD of contour (SDC), and dROCS area/disc area (DA).

    • Main Results:

    • LC, SDC, and dROCS/DA showed statistically significant differences between groups (P < 0.001).
    • Combined LC and SDC achieved 75.3% correct classification.
    • Combined dROCS/DA and SDC reached 80.6% correct classification, with an ROC area of 0.879.

    Conclusions:

    • Novel HRT parameters LC, SDC, and dROCS/DA aid in discriminating between glaucoma and normal subjects.
    • Differences in dROCS contour shape suggest greater irregularities in POAG patients.
    • These findings support the clinical utility of advanced HRT analysis for glaucoma detection.