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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...
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...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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...

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Related Experiment Video

Updated: May 18, 2026

Laser Capture Microdissection of Highly Pure Trabecular Meshwork from Mouse Eyes for Gene Expression Analysis
13:47

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Primary open-angle glaucoma vs normal-tension glaucoma: the vascular perspective.

Stephanie Mroczkowska1, Alexandra Benavente-Perez, Anil Negi

  • 1Vascular Research Laboratory, Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, England.

JAMA Ophthalmology
|September 12, 2012
PubMed
Summary

Patients with primary open-angle glaucoma (POAG) and normal-tension glaucoma (NTG) show similar early-stage vascular dysfunction in both the eyes and body, suggesting shared vascular risk factors.

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Last Updated: May 18, 2026

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13:47

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Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
08:30

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation

Published on: March 12, 2016

Area of Science:

  • Ophthalmology
  • Cardiology
  • Vascular Biology

Background:

  • Primary open-angle glaucoma (POAG) and normal-tension glaucoma (NTG) are distinct clinical entities.
  • Early-stage vascular function in these conditions is not well understood.
  • Investigating shared vascular mechanisms may offer new insights into glaucoma pathogenesis.

Purpose of the Study:

  • To compare ocular and systemic vascular function in newly diagnosed, untreated POAG and NTG patients.
  • To identify similarities and differences in vascular profiles between POAG and NTG.
  • To assess the role of vascular risk factors in early glaucoma.

Main Methods:

  • Systemic vascular function assessed via 24-hour ambulatory blood pressure monitoring, pulse-wave analysis, and carotid intima-media thickness.
  • Ocular vascular reactivity evaluated using dynamic retinal vessel analysis (Imedos, GmbH).
  • Study included 19 POAG patients, 19 NTG patients, and 20 healthy controls.

Main Results:

  • Both POAG and NTG groups showed increased nocturnal blood pressure variability, peripheral arterial stiffness, and carotid intima-media thickness compared to controls.
  • Reduced ocular perfusion pressure was observed in both glaucoma groups.
  • Dynamic retinal vessel analysis revealed steeper arterial constriction slopes and increased arterial/venous diameter fluctuations in POAG and NTG patients.

Conclusions:

  • Early-stage POAG and NTG exhibit comparable ocular and systemic circulatory alterations.
  • These findings underscore the significance of vascular risk factors in both glaucoma types.
  • The similar vascular profiles challenge the current classification of POAG and NTG as entirely separate conditions.