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OCT-Based Quantification and Classification of Optic Disc Structure in Glaucoma Patients.

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Summary

This study developed an objective method using swept-source optical coherence tomography (SS-OCT) to classify open-angle glaucoma (OAG) optic discs into four types. The new technique achieved 80% accuracy in classifying glaucomatous optic discs.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Open-angle glaucoma (OAG) diagnosis and classification rely on optic disc assessment.
  • Nicolela's classification system categorizes OAG optic discs into focal ischemic (FI), myopic (MY), senile sclerotic (SS), and generalized enlargement (GE) types.
  • Objective and reproducible methods for optic disc classification are needed.

Purpose of the Study:

  • To objectively classify the four Nicolela disc types in open-angle glaucoma (OAG) patients using swept-source optical coherence tomography (SS-OCT).
  • To develop a discriminant formula for accurate glaucomatous optic disc classification.

Main Methods:

  • 113 eyes of OAG patients were analyzed using SS-OCT (DRI OCT-1, TOPCON).
  • Newly developed software quantified 20 optic disc parameters.
  • A reference plane (RP) height of 120 μm above Bruch's membrane opening was determined to be optimal.
  • A training group (72 eyes) and validation group (60 eyes) were used to derive and test a discriminant formula.

Main Results:

  • Six parameters, including disc angle, average cup depth, cup/disc ratio, rim-decentering ratio, and average rim/disc ratio, were significant for disc type discrimination.
  • The classification method achieved an 80.0% identification rate and a Cohen's Kappa of 0.73 in the validation group.
  • The chosen RP height minimized disc type influence on parameter correlation with circumpapillary retinal nerve fiber layer thickness (cpRNFLT).

Conclusions:

  • An objective SS-OCT-based method for classifying glaucomatous optic discs was successfully developed.
  • The method demonstrates high reproducibility and accuracy for categorizing OAG optic discs into Nicolela's types.
  • This technique offers a valuable tool for objective glaucoma assessment.