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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Updated: Apr 20, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Advanced imaging for glaucoma study: design, baseline characteristics, and inter-site comparison.

Phuc V Le1, Xinbo Zhang2, Brian A Francis3

  • 1Department of Ophthalmology, University of Southern California, Los Angeles, California.

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|December 3, 2014
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Summary

This study found that variations between clinical sites were minimal, making it appropriate to combine data from different centers for glaucoma research. This ensures reliable analysis of imaging instruments for glaucoma diagnosis.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Glaucoma diagnosis relies on accurate imaging techniques.
  • Multicenter studies require consistent data across sites.
  • Understanding variations in imaging data is crucial for large-scale research.

Purpose of the Study:

  • To characterize participants in the Advanced Imaging for Glaucoma Study.
  • To assess inter-site variations in subject characteristics and imaging instrument performance.
  • To establish the reliability of data for multicenter glaucoma research.

Main Methods:

  • A longitudinal observational cohort study involving 788 participants across 3 academic centers.
  • Utilized optical coherence tomography (OCT), scanning laser polarimetry, and confocal scanning laser ophthalmoscopy.
  • Collected data on clinical examination, automated perimetry, and imaging-derived anatomic variables.

Main Results:

  • Glaucoma groups showed significantly reduced anatomic measurements compared to normal participants.
  • Fourier-domain OCT demonstrated the highest repeatability for nerve fiber layer thickness (<2% CV).
  • Inter-site differences accounted for less than 25% of within-group variation.

Conclusions:

  • Site-to-site variation in imaging data is less significant than within-group variability and glaucoma-related changes.
  • Pooling data from multiple centers is appropriate for the Advanced Imaging for Glaucoma Study.
  • Findings support the use of combined data for robust glaucoma research.