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Related Concept Videos

Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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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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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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: Jun 26, 2025

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A new self-adjustable glaucoma valve.

Soroush Rafiei1, Julien Maxime Gerber1, Stéphane Bigler1

  • 1Laboratory of Hemodynamics and Cardiovascular Technology (LHTC), Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland.

Frontiers in Bioengineering and Biotechnology
|May 17, 2024
PubMed
Summary
This summary is machine-generated.

A novel self-adjustable glaucoma drainage device (SAGDD) dynamically modulates fluidic resistance to maintain target intraocular pressure (IOP). This innovative device shows promise for effective glaucoma treatment, offering a cost-effective and simple solution.

Keywords:
IOP managementSAGDDfluid-solid interactionglaucomapressure-regulatorself-adjustable valve

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Area of Science:

  • Biomedical Engineering
  • Ophthalmology
  • Fluid Dynamics

Background:

  • Glaucoma is a leading cause of irreversible blindness affecting over 70 million people worldwide.
  • High intraocular pressure (IOP) is a critical factor in glaucoma progression.
  • Current treatments, including glaucoma drainage devices (GDDs), may be insufficient for some patients.

Purpose of the Study:

  • To introduce and validate a novel self-adjustable glaucoma drainage device (SAGDD).
  • To design a SAGDD capable of dynamically modulating fluidic resistance to maintain IOP within a target range (10-18 mmHg).
  • To optimize SAGDD design parameters using computational modeling and in vitro testing.

Main Methods:

  • Development of a SAGDD inspired by the starling resistor principle, featuring a flexible membrane.
  • Utilization of fluid-solid interaction (FSI) numerical models and parametric studies for design optimization.
  • Fabrication of a 3:1 scale prototype and in vitro testing to validate numerical simulations.

Main Results:

  • Numerical simulations confirmed the feasibility of the SAGDD concept.
  • A 3:1 scale SAGDD with an 8.1 mm diameter and a 10 µm stainless-steel membrane maintained target IOP.
  • Effective IOP regulation was observed under external pressures of 7.5 and 10 mmHg.

Conclusions:

  • The study provides a foundation for the potential efficacy of SAGDDs in glaucoma management.
  • The SAGDD's cost-effectiveness and simple design present a promising approach for addressing glaucoma challenges.
  • Further research is warranted to explore the clinical application of this innovative device.