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Related Concept Videos

Glaucoma: Overview01:25

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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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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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Angle Closure Glaucoma: Treatment01:28

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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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Glomerular Filtration: Net Filtration Pressure01:26

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Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal...
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Ophthalmic Drug Delivery Systems01:23

Ophthalmic Drug Delivery Systems

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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

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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...
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Related Experiment Video

Updated: May 5, 2026

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
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Ocular perfusion pressure in glaucoma.

Vital P Costa1, Alon Harris, Douglas Anderson

  • 1Department of Ophthalmology, University of Campinas, Campinas, Brazil.

Acta Ophthalmologica
|November 19, 2013
PubMed
Summary
This summary is machine-generated.

Ocular perfusion pressure (OPP) is linked to glaucoma development and progression. Maintaining a balance between intraocular pressure (IOP) and blood pressure (BP) is crucial for preventing optic nerve damage.

Keywords:
blood pressureglaucoma risk factorsocular perfusion pressureoptic nerve blood flow

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Area of Science:

  • Ophthalmology
  • Cardiovascular Science
  • Neuroscience

Background:

  • Glaucoma is a leading cause of irreversible blindness worldwide.
  • Ocular perfusion pressure (OPP) is a critical factor in maintaining adequate blood flow to the optic nerve.
  • Understanding the relationship between OPP and glaucoma is essential for developing effective prevention and treatment strategies.

Purpose of the Study:

  • To review the definition and calculation of OPP.
  • To explore epidemiological evidence linking OPP to glaucoma prevalence, incidence, and progression.
  • To elucidate the mechanisms underlying the OPP-glaucoma association and the role of circadian variations and medications.

Main Methods:

  • Literature review of epidemiological studies and mechanistic investigations.
  • Analysis of factors influencing OPP calculation.
  • Discussion of circadian variations and medication effects on OPP.

Main Results:

  • OPP influences glaucoma development and progression through complex interactions with intraocular pressure (IOP) and blood pressure (BP).
  • Epidemiological studies show a correlation between altered OPP and glaucoma.
  • Circadian variations and systemic/topical medications significantly affect OPP.

Conclusions:

  • The balance between IOP and BP, modulated by ocular autoregulation, is a key determinant of optic nerve damage in glaucoma.
  • Further prospective, longitudinal studies are required to definitively establish the role of OPP in glaucoma pathogenesis and progression.