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Association between Combined Structure Function Index and Glaucoma Severity.

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The combined structure function index (CSFI) shows moderate correlation with standard automated perimetry (SAP) parameters in open-angle glaucoma. However, consistency is low in middle-stage glaucoma, indicating potential limitations in assessing disease progression.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Open-angle glaucoma (OAG) management relies on assessing structural and functional changes.
  • Standard automated perimetry (SAP) measures visual field function, while optical coherence tomography (OCT) assesses optic nerve structure.
  • A combined index may offer a more comprehensive assessment of glaucoma severity.

Purpose of the Study:

  • To investigate the relationship between the combined structure function index (CSFI) and standard automated perimetry (SAP) parameters (mean deviation [MD] and visual field index [VFI]).
  • To evaluate the correlation of CSFI with SAP parameters across different stages of open-angle glaucoma.

Main Methods:

  • Retrospective review of 195 eyes from patients with OAG or normal-tension glaucoma.
  • Simultaneous SAP and OCT measurements were analyzed.
  • Patients were categorized into early, middle, and advanced stages based on MD values.
  • Pearson's correlation coefficient was used to assess relationships between CSFI and SAP parameters.

Main Results:

  • Strong correlations were observed between CSFI and overall MD (r=-0.88) and VFI (r=-0.86).
  • Correlations varied by disease stage, with lower consistency noted in the middle stage (MD: r=-0.24, VFI: r=-0.20).
  • Mean CSFI, MD, and VFI values differed significantly across early, middle, and advanced glaucoma stages.

Conclusions:

  • CSFI demonstrates a significant correlation with SAP indices in open-angle glaucoma.
  • The consistency between CSFI and SAP parameters is notably lower in the middle stage of glaucoma.
  • Further research is needed to refine combined indices for accurate glaucoma staging and progression monitoring.