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Related Concept Videos

Glaucoma: Overview01:25

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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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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.
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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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Electrophysiology in Glaucoma.

Cassia Senger1, Renata Moreto1, Sung E S Watanabe2

  • 1Department of Ophthalmology, Otorhinolaryngology and Head and Neck Surgery, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto.

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Summary

Electrophysiological tests show promise for glaucoma evaluation by correlating with structural and functional measures. However, further development is needed for routine clinical use in early detection and follow-up.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Imaging

Background:

  • Electrophysiological testing is crucial for evaluating retinal ganglion cells and diagnosing glaucoma.
  • Recent advancements have focused on refining these tests for clinical application.

Purpose of the Study:

  • To review recent studies on the clinical applicability of visual system electrophysiological tests in glaucoma.
  • To assess the correlation between electrophysiological measures and established glaucoma diagnostic tools.

Main Methods:

  • A systematic literature review was conducted using PubMed and EMBASE databases.
  • Searched for English articles published between January 1, 2014, and July 1, 2019.
  • 38 studies were selected, with data from 30 studies tabulated.

Main Results:

  • Photopic negative response and reversal pattern electroretinography were primary methods for retinal ganglion cell response recording.
  • Multifocal electroretinography and multifocal visual evoked potential were also explored.
  • A consistent correlation was observed between amplitude/latency measures and standard glaucoma tests like perimetry and OCT.

Conclusions:

  • Clinical electrophysiological testing aligns well with structural and functional glaucoma analyses.
  • Definitive indications for early detection or follow-up are not yet established.
  • Easier protocols and improved topographical correlation are necessary for routine clinical adoption.