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Related Concept Videos

Glaucoma: Overview01:25

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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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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.
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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: Mar 8, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Predicting conversion to glaucoma using standard automated perimetry and frequency doubling technology.

Genichiro Takahashi1, Shaban Demirel2, Chris A Johnson3

  • 1Department of Ophthalmology, Jikei University, School of Medicine, Katsushika Medical Center, Tokyo, Japan.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|January 23, 2017
PubMed
Summary

Prior visual field data can predict future glaucoma development years in advance, even when initial tests appear normal. This aids in early detection of glaucomatous optic neuropathy.

Keywords:
Frequency doublingGlaucomaProgressionVisual fields

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Area of Science:

  • Ophthalmology
  • Visual Science

Background:

  • Glaucoma is a progressive optic neuropathy characterized by visual field loss.
  • Early detection and prediction of glaucoma progression are crucial for timely intervention and vision preservation.

Purpose of the Study:

  • To determine if prior visual field information can predict the development of glaucomatous visual fields several years in advance.
  • To test the hypothesis that early signs of glaucoma are detectable in visual field data before overt abnormalities manifest.

Main Methods:

  • A longitudinal study prospectively enrolled 107 eyes with established or suspected glaucoma.
  • Annual visual field testing was performed using standard automated perimetry (SAP) and frequency doubling technology (FDT) perimetry.
  • Classification tree analysis was employed using baseline test results to predict future disease conversion.

Main Results:

  • Classification trees built on baseline data demonstrated high specificity (near 100%) in predicting glaucoma conversion.
  • Sensitivity for predicting conversion using baseline data ranged from 25-50%.

Conclusions:

  • Visual field results contain predictive information for glaucoma development, even when tests are initially within normal limits.
  • Early identification of at-risk eyes is possible through careful analysis of baseline visual field data.