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Related Concept Videos

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...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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...
Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial infections,...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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Related Experiment Video

Updated: May 27, 2026

Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas
07:43

Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas

Published on: January 17, 2018

Acute sphenoid sinusitis induced blindness: a case report.

Shawn C Reynolds1, Elizabeth M Evans

  • 1Department of Emergency Medicine, Lehigh Valley Hospital and Health Network, Allentown, Pennsylvania 18103, USA.

The Journal of Emergency Medicine
|November 11, 2011
PubMed
Summary
This summary is machine-generated.

Acute sphenoid sinusitis can cause sudden vision loss. Prompt diagnosis and endoscopic sphenoidotomy in children can restore vision and prevent permanent optic nerve damage.

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Area of Science:

  • Otolaryngology
  • Ophthalmology
  • Pediatric Emergency Medicine

Background:

  • Acute, isolated sphenoid sinusitis is a rare condition with severe potential consequences, including permanent vision loss from optic nerve injury.
  • Symptoms may include preseptal inflammation, eyelid edema, chemosis, or ophthalmoplegia.

Observation:

  • A 10-year-old child presented with painless, progressive vision loss in one eye over 5 days.
  • Examination revealed decreased visual acuity, a non-reactive pupil, and elevated intraocular pressures.

Findings:

  • Magnetic resonance imaging confirmed acute sphenoid sinusitis compressing and compromising the optic nerve.
  • The diagnosis was established in a pediatric patient presenting with acute vision loss.

Implications:

  • Sphenoid sinusitis must be considered in the differential diagnosis of acute vision loss, especially in pediatric cases.
  • Early diagnosis and intervention, such as endoscopic sphenoidotomy, are crucial for preventing permanent visual complications.