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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...

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Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Detecting glaucomatous progression using GDx with variable and enhanced corneal compensation using Guided Progression

Dilraj S Grewal1, Mitra Sehi, David S Greenfield

  • 1Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Palm Beach Gardens, FL 33418, USA.

The British Journal of Ophthalmology
|July 24, 2010
PubMed
Summary

This study compared two corneal compensation methods for detecting glaucoma progression using scanning laser polarimetry. Both methods showed moderate agreement, with one strategy demonstrating stronger concordance for identifying glaucoma progression.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Glaucoma progression detection is crucial for timely intervention.
  • Scanning laser polarimetry (SLP) is an imaging technique used in glaucoma assessment.
  • Corneal compensation methods aim to improve the accuracy of SLP measurements.

Purpose of the Study:

  • To compare the efficacy of two corneal compensation methods, variable corneal compensation (GDxVCC) and enhanced corneal compensation (GDxECC), in detecting glaucoma progression.
  • To evaluate the agreement between these two SLP methods and standard automated perimetry (SAP) in identifying disease progression.

Main Methods:

  • Prospective enrollment of normal, glaucoma suspect, and glaucoma patients over 36 months.
  • All subjects underwent eye examination, SAP, and SLP with GDxVCC and GDxECC.
  • Glaucoma progression was assessed using visual-field index (VFI) for SAP and Guided Progression Analysis (GDxGPA) software for SLP, with specific criteria for GDx progression detection.

Main Results:

  • Progression was detected in 8.8% of eyes with GDxVCC and 11.8% with GDxECC; SAP detected progression in 10.3% of eyes.
  • The strongest agreement between GDxVCC and GDxECC was observed using progression method C (kappa=0.57).
  • No significant association was found between typical scan score (TSS) and progression detection using either VCC or ECC.

Conclusions:

  • GDxGPA software offers a novel approach for detecting glaucoma progression.
  • GDxVCC and GDxECC demonstrate moderate agreement in identifying glaucoma progression.
  • The choice of progression detection strategy within GDxGPA influences the agreement between SLP methods.