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Related Concept Videos

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...
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...

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Related Experiment Video

Updated: Jul 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

Dark-room prone-position test for intermittent angle closure.

Tae-Woo Kim1, Ki Ho Park, Chul Hong

  • 1Department of Ophthalmology, Seoul National University Bundang Hospital, Seongnam, Korea.

Korean Journal of Ophthalmology : KJO
|September 7, 2007
PubMed
Summary
This summary is machine-generated.

The dark-room prone-position test (DRPT) safely and effectively diagnoses intermittent angle closure (IAC). Lens thickness correlates with increased intraocular pressure (IOP) during this test.

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Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
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Area of Science:

  • Ophthalmology
  • Glaucoma Research

Background:

  • Intermittent angle closure (IAC) poses diagnostic challenges.
  • Accurate diagnosis is crucial for preventing vision loss.

Purpose of the Study:

  • Evaluate the efficacy and safety of the dark-room prone-position test (DRPT) for diagnosing IAC.
  • Investigate correlations between A-scan ultrasound biometry and DRPT outcomes.

Main Methods:

  • Retrospective review of 37 eyes from 24 patients diagnosed with IAC who underwent DRPT.
  • Measured intraocular pressure (IOP) changes and A-scan ultrasound biometrics.
  • Defined a positive DRPT as an IOP increase of ≥8 mmHg from baseline.
  • Used linear regression to analyze associations between IOP elevation and biometric parameters.

Main Results:

  • DRPT yielded positive results in 28 eyes (19 patients).
  • IOP normalized within 2 hours post-test for all patients.
  • A significant correlation was found between lens thickness and IOP elevation during DRPT (r=0.338, p=0.041).

Conclusions:

  • DRPT is a safe and effective diagnostic tool for IAC.
  • The test aids in establishing a definitive diagnosis of IAC.
  • Lens thickness is associated with positive DRPT responses.