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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...
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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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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, whereas...
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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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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...

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Glaucomatous outflow pathway and oxidative stress.

Sergio Claudio Saccà1, Alberto Izzotti, Pietro Rossi

  • 1San Martino Hospital, Section of Ophthalmology, Largo Rosanna Benzi 1, 16132 Genova, Italy. sergio.sacca@hsanmartino.it

Experimental Eye Research
|January 2, 2007
PubMed
Summary

Oxidative stress from reactive oxygen species (ROS) damages human trabecular meshwork cells, contributing to elevated intraocular pressure and vision loss in glaucoma. Targeting oxidative damage may offer new prevention and treatment strategies for primary open-angle glaucoma.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Oxidative Stress Research

Background:

  • Reactive oxygen species (ROS) and oxidative stress impact human trabecular meshwork (HTM) cellularity.
  • Elevated intraocular pressure (IOP) in glaucoma is linked to oxidative damage in HTM cells.

Purpose of the Study:

  • To investigate the role of oxidative stress in the pathogenesis of primary open-angle glaucoma (POAG).
  • To explore oxidative damage as a potential therapeutic target for glaucoma.

Main Methods:

  • Review of existing evidence on ROS effects on HTM cells.
  • Analysis of the correlation between oxidative DNA damage, IOP, and visual field defects.

Main Results:

  • ROS reduce antioxidant activity, increase outflow resistance, and alter HTM cell integrity.
  • A significant correlation exists between HTM oxidative DNA damage, elevated IOP, and visual field defects.
  • Oxidative stress contributes to altered NO/endothelin homeostasis and potential ganglion cell death.

Conclusions:

  • Oxidative damage is a key factor in POAG pathogenesis.
  • Targeting oxidative stress could be crucial for glaucoma prevention and therapy.