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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 15, 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

Glaucoma screening using relative afferent pupillary defect.

Resmi A Charalel1, Hugh S Lin, Kuldev Singh

  • 1Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, CA.

Journal of Glaucoma
|January 9, 2013
PubMed
Summary
This summary is machine-generated.

The swinging flashlight test for relative afferent pupillary defect (RAPD) shows moderate sensitivity and high specificity for detecting glaucoma. This screening test is more accurate in patients without prior cataract surgery.

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Area of Science:

  • Ophthalmology
  • Diagnostic Testing
  • Neurology

Background:

  • Glaucomatous optic neuropathy is a progressive condition affecting vision.
  • Early detection of glaucoma is crucial for preventing irreversible vision loss.
  • Screening tests are vital for identifying individuals at risk.

Purpose of the Study:

  • To evaluate the effectiveness of the swinging flashlight test for detecting relative afferent pupillary defect (RAPD) as a screening tool for glaucoma.
  • To assess the sensitivity and specificity of RAPD screening in a diverse patient population.

Main Methods:

  • A prospective study involving 107 patients (glaucomatous and non-glaucomatous).
  • The swinging flashlight test, with optional neutral density filters, was used to identify RAPD by a masked, non-ophthalmologist.
  • Glaucoma diagnosis and staging were determined by ophthalmologists based on clinical examination and history, independent of RAPD results.

Main Results:

  • A present RAPD indicated an odds ratio of 9.71 for glaucoma (sensitivity 66.7%, specificity 82.9%).
  • In patients without prior cataract surgery, the odds ratio for glaucoma with RAPD increased to 17.05 (sensitivity 68.8%, specificity 88.6%).

Conclusions:

  • The swinging flashlight test for RAPD is a moderately sensitive and highly specific screening method for glaucoma.
  • Excluding patients with previous cataract surgery enhances the accuracy of RAPD screening for glaucoma detection.