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Related Concept Videos

Open Angle Glaucoma: Treatment01:27

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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: Oct 11, 2025

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
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Modulation of Human Intraocular Pressure Using a Pneumatic System.

Benedikt Krauß1, Dietmar Link2,3, Richard Stodtmeister4,5

  • 1Imedos Systems GmbH, Jena, Germany.

Translational Vision Science & Technology
|December 2, 2021
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Summary

A novel pneumatic system precisely modulates intraocular pressure (IOP) in the human eye. This technology offers a more accurate and stable method for IOP modulation, aiding clinical applications.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Intraocular pressure (IOP) modulation is crucial for diagnosing and managing various eye conditions.
  • Existing methods for IOP manipulation may lack precision and stability.
  • A novel pneumatic system offers a potential advancement in IOP control.

Purpose of the Study:

  • To technically validate a new pneumatically driven system for modulating intraocular pressure (IOP).
  • To assess the system's applicability and performance in the human eye.
  • To evaluate the use of a pneumatically driven balloon contacting the conjunctiva for IOP modulation.

Main Methods:

  • A customized setup incorporated a force sensor to measure applied pressure from a pneumatic balloon.
  • Intraocular pressure (IOP) was modulated in 10 healthy subjects, increasing to at least 40 mmHg.
  • IOP was measured every 40 seconds for 2 minutes using a rebound tonometer while balloon pressure remained constant.

Main Results:

  • The pneumatic system achieved a stable IOP modulation, with a mean pressure decrease of 2.4 mmHg/min attributed to physiological responses.
  • The system allowed IOP to be increased to an average of 42.8 ± 3.6 mmHg.
  • A slight IOP decrease of 0.71 mmHg was observed within 2 minutes at an operating point of 40 mmHg.

Conclusions:

  • The novel pneumatic system enables targeted and consistent modulation of intraocular pressure (IOP).
  • This technology provides a precise and stable method for IOP control.
  • The system is suitable for clinical applications, particularly for determining retinal vessel pressures.