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Structure-function relationships in glaucoma using enhanced depth imaging optical coherence tomography-derived

Flavio S Lopes1,2, Igor Matsubara1,2, Izabela Almeida1,2

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Enhanced depth imaging optical coherence tomography (EDI OCT) parameters show significant structure-function correlations in glaucoma. Neural tissue-based indexes, particularly BMO-minimum rim width, better reflect glaucoma severity than lamina cribrosa parameters.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Glaucoma is a progressive optic neuropathy characterized by structural damage to the optic nerve head.
  • Enhanced depth imaging spectral-domain optical coherence tomography (EDI OCT) provides high-resolution cross-sectional images of the optic nerve head.
  • Understanding the correlation between structural parameters and visual function is crucial for glaucoma diagnosis and management.

Purpose of the Study:

  • To investigate the correlation between various optic nerve head parameters derived from EDI OCT and visual field status in glaucoma patients.
  • To compare the diagnostic utility of different EDI OCT-derived parameters, including lamina cribrosa and neural tissue measurements.

Main Methods:

  • A prospective study enrolled healthy participants and glaucoma patients with varying disease severity.
  • Enhanced depth imaging spectral-domain optical coherence tomography (EDI OCT) and visual field (VF) testing were performed.
  • Key optic nerve head parameters, including lamina cribrosa (LC) thickness/area, prelaminar neural tissue thickness/area, and Bruch's membrane opening (BMO)-minimum rim width (BMO-MRW), were measured.

Main Results:

  • All evaluated EDI OCT parameters differed significantly between glaucomatous and healthy eyes.
  • Average BMO-MRW showed the most significant differences across mild, moderate, and advanced glaucoma stages.
  • Significant structure-function correlations were observed for prelaminar neural tissue area and BMO-MRW parameters with visual field index (VFI).

Conclusions:

  • Neural tissue-based EDI OCT parameters, especially BMO-MRW, demonstrate stronger correlations with visual function in glaucoma compared to lamina cribrosa parameters.
  • These findings suggest the potential of specific EDI OCT metrics for assessing glaucoma severity and progression.
  • Further research is warranted to explore the diagnostic utility of these parameters.