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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.
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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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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...
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Related Experiment Video

Updated: Apr 23, 2026

Ultrasound Cyclo Plasty in Eyes with Glaucoma
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iStent trabecular micro-bypass stent for open-angle glaucoma.

Kim Le1, Hady Saheb1

  • 1Department of Ophthalmology, McGill University, Montreal, QC, Canada.

Clinical Ophthalmology (Auckland, N.Z.)
|October 7, 2014
PubMed
Summary
This summary is machine-generated.

Trabecular micro-bypass stents (iStents) effectively lower eye pressure and medication needs in open-angle glaucoma patients. These minimally invasive devices are safe, with outcomes comparable to cataract surgery.

Keywords:
MIGSab internoglaucomaiStentsurgerytrabecular micro-bypass

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Area of Science:

  • Ophthalmology
  • Surgical Innovation
  • Glaucoma Management

Background:

  • Open-angle glaucoma is a leading cause of vision loss.
  • Trabecular micro-bypass stents (iStents) are a type of micro-invasive glaucoma surgery (MIGS).
  • iStents enhance aqueous humor outflow to reduce intraocular pressure (IOP).

Purpose of the Study:

  • To review the efficacy and safety of iStents for open-angle glaucoma.
  • To assess cost considerations associated with iStent implantation.
  • To summarize current published data on trabecular micro-bypass stent outcomes.

Main Methods:

  • Systematic review of published studies on iStent implantation.
  • Analysis of data on IOP reduction and ocular medication use.
  • Evaluation of safety profiles and complication rates.

Main Results:

  • Combined iStent implantation with phacoemulsification significantly reduced mean IOP.
  • Ocular medication usage decreased post-implantation.
  • iStents demonstrated a favorable safety profile, similar to cataract surgery, with infrequent complications.

Conclusions:

  • iStents are effective and safe for managing open-angle glaucoma.
  • The procedure offers a significant reduction in IOP and medication burden.
  • Further research is warranted for long-term outcomes and cost-effectiveness.