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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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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

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

Angle Closure Glaucoma: Treatment

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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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Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: Dec 5, 2025

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
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[Modern view on normal-tension glaucoma].

S Yu Petrov1

  • 1Research Institute of Eye Diseases, Moscow, Russia.

Vestnik Oftalmologii
|October 21, 2020
PubMed
Summary
This summary is machine-generated.

Normal-tension glaucoma (NTG) involves vision loss despite normal eye pressure. Emerging research highlights vascular and immune factors, not just intraocular pressure, in NTG development and links it to neurodegenerative diseases.

Keywords:
diagnostic visualization methodsfield of visionneurodegenerative diseasenormal-tension glaucomaopen-angle glaucomaspinal fluid pressure

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Last Updated: Dec 5, 2025

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

  • Ophthalmology
  • Neurology

Background:

  • Glaucoma is a progressive optic neuropathy causing irreversible vision loss.
  • Normal-tension glaucoma (NTG) presents with optic nerve damage and visual field defects despite normal intraocular pressure (IOP).
  • Traditional NTG pathophysiology models focusing solely on IOP are being challenged by new research.

Purpose of the Study:

  • To review current understanding of normal-tension glaucoma (NTG) pathogenesis.
  • To explore the connection between NTG and vascular, immune factors, and translaminar pressure difference.
  • To examine the relationship between glaucoma and cognitive deficits in Alzheimer's and Parkinson's diseases.

Main Methods:

  • Review of current scientific literature and diagnostic advancements.
  • Analysis of neuroimaging techniques for central nervous system visualization.
  • Synthesis of research on multifactorial NTG development mechanisms.

Main Results:

  • NTG pathophysiology is increasingly understood to involve factors beyond intraocular pressure.
  • Vascular and immune system dysregulation are implicated in NTG pathogenesis.
  • NTG may share underlying mechanisms with neurodegenerative conditions like Alzheimer's and Parkinson's diseases.

Conclusions:

  • NTG pathogenesis is complex, involving multiple systemic and local factors.
  • Further research into NTG's multifactorial nature is crucial for developing effective treatments.
  • Understanding NTG's links to neurodegenerative diseases may offer new therapeutic avenues.