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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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...
Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
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...
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...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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Related Experiment Video

Updated: Jun 17, 2026

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
08:55

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

Published on: April 24, 2020

Intracranial pressure and glaucoma.

John P Berdahl1, R Rand Allingham

  • 1Vance Thompson Vision, 1310 W 22nd Street, Sioux Falls, South Dakota, USA. johnberdahl@gmail.com

Current Opinion in Ophthalmology
|December 31, 2009
PubMed
Summary
This summary is machine-generated.

Intracranial pressure (ICP) is lower in glaucoma patients and higher in ocular hypertension, suggesting its crucial role in glaucoma development. This finding highlights the importance of the interplay between intraocular pressure and ICP.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Physiology

Background:

  • Glaucoma pathophysiology remains incompletely understood.
  • The optic nerve traverses both intraocular and intracranial spaces, subject to distinct pressures.
  • The interplay between intraocular pressure (IOP) and intracranial pressure (ICP) is hypothesized to influence glaucoma development.

Purpose of the Study:

  • To review recent findings on the relationship between IOP and ICP in glaucoma.
  • To explore the potential role of ICP in the pathophysiology of glaucoma and ocular hypertension.

Main Methods:

  • Review of recent studies investigating ICP in glaucoma patients.
  • Analysis of mathematical modeling studies on IOP-ICP dynamics.
  • Comparison of ICP levels in glaucoma, normal-tension glaucoma, and ocular hypertension.

Main Results:

  • Patients with glaucoma and normal-tension glaucoma exhibit lower ICP compared to controls.
  • Elevated ICP is observed in individuals with ocular hypertension.
  • Mathematical models indicate ICP's counterbalance effect is significant in glaucoma development.

Conclusions:

  • The relationship between IOP and ICP is a critical factor in glaucoma development.
  • ICP modulation may represent a novel therapeutic target for glaucoma management.