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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...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...

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Related Experiment Video

Updated: Jun 17, 2026

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia
06:15

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia

Published on: August 9, 2024

Screening for glaucoma in high-risk populations using optical coherence tomography.

Gisèle Li1, Alvine Kamdeu Fansi, Jean-François Boivin

  • 1Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada. gisele.li@umontreal.ca

Ophthalmology
|December 25, 2009
PubMed
Summary

Stratus optical coherence tomography (OCT) shows moderate sensitivity and high specificity for detecting definitive glaucoma in high-risk individuals. Combining optic nerve head and retinal nerve fiber layer (RNFL) parameters improves diagnostic accuracy.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Diagnostic Accuracy

Background:

  • Glaucoma screening in high-risk populations is crucial for early detection and intervention.
  • Optical coherence tomography (OCT) offers detailed imaging of the optic nerve and retinal nerve fiber layer (RNFL).

Purpose of the Study:

  • To evaluate the diagnostic accuracy of the Stratus OCT for glaucoma screening.
  • To determine the sensitivity, specificity, and likelihood ratios of Stratus OCT parameters in identifying glaucoma.

Main Methods:

  • A cross-sectional study involving 333 community-based volunteers at high risk for glaucoma.
  • Stratus OCT scans of the optic nerve and peripapillary RNFL were analyzed.
  • Eyes were classified based on ophthalmologic examination and frequency doubling perimetry.

Main Results:

  • Data from 210 eyes were analyzed, with 6 eyes showing definitive glaucoma.
  • Combining optic nerve head and RNFL parameters yielded a sensitivity of 67% and specificity of 96%.
  • The combined parameters resulted in a positive likelihood ratio of 17.08 and a negative likelihood ratio of 0.35.

Conclusions:

  • Stratus OCT demonstrates moderate sensitivity and high specificity for definitive glaucoma when high-quality scans are obtained.
  • Combining optic nerve head and RNFL parameters significantly enhances the specificity of glaucoma detection.