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Related Concept Videos

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...
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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...
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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Related Experiment Video

Updated: May 12, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

Agreement between event-based and trend-based glaucoma progression analyses.

H L Rao1, T Kumbar, A U Kumar

  • 1VST Glaucoma Center, L V Prasad Eye Institute, Hyderabad, India. harshalaxmanarao@gmail.com

Eye (London, England)
|April 20, 2013
PubMed
Summary
This summary is machine-generated.

Glaucoma visual field progression analysis showed moderate agreement between event-based (GPA) and trend-based methods. Both methods identified similar times to progression, with GPA potentially detecting changes earlier.

Related Experiment Videos

Last Updated: May 12, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

Area of Science:

  • Ophthalmology
  • Medical Technology

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Accurate detection of visual field (VF) progression is crucial for managing glaucoma and preventing vision loss.
  • Event-based and trend-based analyses are two common methods for assessing VF progression.

Purpose of the Study:

  • To evaluate the agreement between event-based (Glaucoma Progression Analysis - GPA) and trend-based analyses in determining visual field progression in glaucoma patients.
  • To compare the time to progression as identified by these two analytical methods.

Main Methods:

  • Visual fields from 175 glaucoma eyes with at least 5 VFs were analyzed using proprietary software.
  • Agreement was assessed using the kappa statistic (κ) between GPA and trend-based analysis of the VF index (VFI).
  • Time to progression was calculated for eyes identified as progressing by both methods.

Main Results:

  • Moderate agreement was found between GPA and trend-based analysis (κ = 0.48 to 0.50).
  • GPA classified 25.2% of eyes as likely progressing, while trend-based analysis (sensitive criteria) identified 30.3% as progressing.
  • No statistically significant difference was observed in the median time to progression between the two methods for eyes progressing by both criteria.

Conclusions:

  • Event-based (GPA) and trend-based analyses demonstrate moderate agreement in detecting glaucoma visual field progression.
  • While GPA may suggest earlier detection, this study did not find statistically significant differences in the time to progression between the methods.
  • Both methods are valuable tools for monitoring glaucoma, with potential complementary roles in clinical practice.