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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: Dec 7, 2025

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
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Short-term Postoperative Visual Acuity Decrease and Recovery after Ahmed Tube Shunt Procedure for Glaucoma.

Yingna Liu1, Lijuan Huang2, Qian Zhao3

  • 1Department of Ophthalmology, University of California, San Francisco, San Francisco, California.

Ophthalmology. Glaucoma
|September 27, 2020
PubMed
Summary
This summary is machine-generated.

Vision loss after Ahmed tube shunt surgery typically resolves by 3 months, with 9.3% experiencing significant vision loss at 6 months. Postoperative antimetabolite injections may reduce this risk.

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Area of Science:

  • Ophthalmology
  • Glaucoma Surgery
  • Vision Science

Background:

  • The Ahmed tube shunt is a common surgical intervention for glaucoma.
  • Understanding the visual outcomes and potential complications is crucial for patient management.

Purpose of the Study:

  • To analyze vision loss and recovery following Ahmed tube shunt procedures.
  • To identify risk factors contributing to significant vision loss 6 months postoperatively.

Main Methods:

  • A retrospective chart review of adult patients who underwent Ahmed glaucoma valve surgery.
  • Analysis of corrected visual acuity (CVA) at 1 week, 1, 3, and 6 months postoperatively.
  • Logistic regression to determine risk factors for vision loss.

Main Results:

  • Mean CVA worsened at 1 week but returned to baseline by 3 months postoperatively.
  • At 6 months, 39.2% had any vision loss and 9.3% had ≥3 lines of CVA loss.
  • Preexisting ocular conditions and cataract progression were common causes of vision loss; antimetabolite injection reduced risk.

Conclusions:

  • Ahmed tube shunt surgery can cause temporary vision loss, usually recovering by 3 months.
  • A small proportion of patients experience persistent vision loss, influenced by factors like preexisting conditions.
  • Postoperative antimetabolite injections appear to be protective against significant vision loss.