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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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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

Detecting glaucoma with visual fields derived from frequency-domain optical coherence tomography.

Xian Zhang1, Ali S Raza, Donald C Hood

  • 1Department of Psychology, Columbia University, New York, NY, USA. xzhang63@gmail.com

Investigative Ophthalmology & Visual Science
|April 20, 2013
PubMed
Summary
This summary is machine-generated.

Optical coherence tomography (OCT) can derive visual fields (VFs) as accurately as traditional methods for detecting glaucoma. Combining OCT-derived and actual VFs may offer a more powerful diagnostic tool for glaucomatous damage.

Keywords:
OCTglaucomavisual field

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Glaucomatous damage assessment traditionally relies on static automated perimetry for visual field (VF) testing.
  • Frequency-domain optical coherence tomography (OCT) provides detailed retinal nerve fiber layer (RNFL) and retinal ganglion cell (RGC) thickness measurements.
  • Integrating OCT data could potentially enhance VF assessment for glaucoma.

Purpose of the Study:

  • To compare the diagnostic accuracy of VFs derived from OCT scans against VFs obtained from standard static automated perimetry.
  • To evaluate the effectiveness of OCT-derived VFs in detecting glaucomatous damage.

Main Methods:

  • Retinal ganglion cell (RGC) and retinal nerve fiber layer (RNFL) thicknesses were measured using OCT macular and disc cube scans.
  • Data from 84 glaucoma patients/suspects and 128 healthy subjects were analyzed.
  • A multiple linear regression (MLR) model was used to create an OCT-to-VF transformation map, generating derived VFs.

Main Results:

  • The derived VF demonstrated 78.0% sensitivity and 98.0% specificity in detecting glaucomatous damage across all hemifields.
  • Agreement between derived and actual VFs was 82.2%.
  • Derived VF values showed a linear relationship with actual VF values at each location.

Conclusions:

  • OCT-derived VFs show comparable sensitivity to actual VFs in identifying glaucomatous damage.
  • The combination of OCT-derived and actual VFs is proposed as a more potent diagnostic approach due to potentially independent sources of variability.