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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...
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

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Related Experiment Video

Updated: May 29, 2026

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

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Published on: May 25, 2020

Comparison of visual field severity classification systems for glaucoma.

Minna Ng1, Pamela A Sample, John P Pascual

  • 1Hamilton Glaucoma Center, University of California, San Diego, La Jolla, CA, USA.

Journal of Glaucoma
|September 1, 2011
PubMed
Summary

Comparing glaucoma severity classification systems reveals differences in staging. The Enhanced Glaucoma Severity Staging system (eGSS) showed substantial agreement and may be preferable for clinicians and researchers evaluating glaucomatous optic neuropathy.

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Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Visual Field Analysis

Background:

  • Accurate glaucoma severity classification is crucial for patient management and research.
  • Existing systems like the Advanced Glaucoma Intervention Study scoring system (AGIS) and Glaucoma Severity Staging system (GSS) have limitations.
  • The Enhanced Glaucoma Severity Staging system (eGSS) was developed to potentially improve classification.

Purpose of the Study:

  • To compare the categorical severity classification of glaucoma using AGIS, GSS, and eGSS.
  • To evaluate the agreement between these systems and with optic disc assessment.
  • To determine the most suitable system for clinical and research applications.

Main Methods:

  • Cross-sectional study of 1,921 eyes from 1,137 participants.
  • Automated perimetry fields classified using AGIS, GSS, and eGSS.
  • Comparison of systems using continuous severity measures (mean deviation, pattern standard deviation, visual field index) and kappa statistics for agreement.

Main Results:

  • Significant differences in severity staging were observed between GSS and AGIS, and GSS and eGSS.
  • Substantial agreement was found between AGIS and eGSS (κ=0.715), while agreement with GSS was moderate (κ=0.559 and κ=0.519).
  • eGSS tended to classify abnormal fields as most severe, followed by GSS, then AGIS.

Conclusions:

  • All systems show increasing glaucomatous optic neuropathy with higher severity stages.
  • Different classification systems result in distinct severity staging outcomes.
  • The eGSS system is recommended due to its ease of use for both clinicians and researchers.