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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

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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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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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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Prosopagnosia01:24

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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Related Experiment Video

Updated: Jan 16, 2026

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
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Beyond the Eye: Glaucoma and the Brain.

Marco Zeppieri1,2, Federico Visalli3, Mutali Musa4,5

  • 1Department of Ophthalmology, University Hospital of Udine, 33100 Udine, Italy.

Brain Sciences
|September 27, 2025
PubMed
Summary
This summary is machine-generated.

Glaucoma involves more than just the eye; it shows brain changes similar to neurodegenerative diseases. This suggests new treatments targeting the central nervous system (CNS) for glaucoma patients.

Keywords:
central nervous systemglaucomaneurodegenerationneuroprotectionretinal ganglion cells

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Area of Science:

  • Neuro-ophthalmology
  • Neurodegeneration
  • Central Nervous System (CNS) Research

Background:

  • Glaucoma traditionally viewed as an ocular disease causing retinal ganglion cell (RGC) loss.
  • Emerging evidence indicates glaucoma involves trans-synaptic neurodegeneration and central brain changes.

Purpose of the Study:

  • To review evidence supporting glaucoma's classification as a CNS disease.
  • To explore shared mechanisms between glaucoma and neurodegenerative disorders.
  • To discuss clinical implications of glaucoma's brain involvement.

Main Methods:

  • Narrative review of neuroimaging and neurocognitive studies in glaucoma patients.
  • Synthesis of evidence on central nervous system (CNS) pathology in glaucoma.
  • Exploration of shared pathophysiological mechanisms with Alzheimer's and Parkinson's disease.

Main Results:

  • Glaucoma patients exhibit brain connectivity alterations and cortical thinning.
  • Shared mechanisms include mitochondrial dysfunction, inflammation, and impaired axonal transport.
  • Glaucoma shares neurodegenerative pathways with diseases like Alzheimer's and Parkinson's.

Conclusions:

  • Glaucoma's pathophysiology extends to the central nervous system (CNS).
  • Neuroprotective and neuroregenerative strategies targeting the CNS offer therapeutic potential.
  • Neuroimaging biomarkers and brain-targeted interventions may advance glaucoma diagnosis and treatment.