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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

Photoreceptors and Visual Pathways

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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: Jul 15, 2025

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
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Neurovascular dysfunction in glaucoma.

Luis Alarcon-Martinez1, Yukihiro Shiga2, Deborah Villafranca-Baughman2

  • 1Department of Neuroscience, Université de Montréal, PO Box 6128, Station centre-ville, Montreal, QC, Canada; Neuroscience Division, Centre de recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montreal, QC, Canada; Centre for Eye Research Australia, University of Melbourne, Melbourne, Australia.

Progress in Retinal and Eye Research
|October 1, 2023
PubMed
Summary
This summary is machine-generated.

Glaucoma damages retinal ganglion cells due to impaired blood flow regulation. This review explores the neurovascular unit

Keywords:
Blood-brain/retinal-barriersFunctional hyperemiaGlaucomaInter-pericyte tunneling nanotubesNeurovascular unitPericytesRetinal ganglion cells

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Area of Science:

  • Ophthalmology and Neuroscience
  • Vascular Biology
  • Cellular Biology

Background:

  • Retinal ganglion cells require substantial oxygen and nutrients, making blood flow regulation critical.
  • Glaucoma is associated with vascular deficits, including impaired autoregulation and neurovascular coupling.
  • The neurovascular unit, comprising various cell types, orchestrates retinal blood flow and function.

Purpose of the Study:

  • To review the role of the neurovascular unit in regulating retinal blood flow.
  • To examine how glaucomatous stress affects neurovascular interactions.
  • To highlight the function of pericytes and tunneling nanotubes in retinal vascular regulation.

Main Methods:

  • Literature review focusing on the neurovascular unit in glaucoma.
  • Analysis of cellular and molecular mechanisms of neurovascular interactions.
  • Discussion of pericyte function and tunneling nanotubes in retinal vasculature.

Main Results:

  • The neurovascular unit's components are crucial for maintaining retinal homeostasis.
  • Pericytes play a significant role in neurovascular coupling, particularly via tunneling nanotubes.
  • Dysfunctional neurovascular units contribute to glaucomatous pathology.

Conclusions:

  • Understanding neurovascular unit dysfunction is key to developing glaucoma therapies.
  • Targeting pericytes and tunneling nanotubes offers potential for vascular protection and regeneration.
  • Restoring neurovascular function may improve outcomes for glaucoma patients.