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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...
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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

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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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.
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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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[Blindness due to acute ethmoiditis].

Mikkel Christian Alanin1

  • 1Øre-naese-halskirurgisk Afdeling, Naestved Hospital, 4700 Naestved, Denmark. mikkel_alanin@hotmail.com

Ugeskrift for Laeger
|August 24, 2010
PubMed
Summary
This summary is machine-generated.

Acute ethmoiditis can rarely cause blindness without an orbital abscess, likely due to optic nerve inflammation. This case highlights a rare complication of sinusitis in children.

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Area of Science:

  • Ophthalmology
  • Otorhinolaryngology
  • Pediatric Infectious Diseases

Background:

  • Orbital complications secondary to acute ethmoiditis are well-documented.
  • Early diagnosis and treatment of acute ethmoiditis are crucial to prevent severe outcomes.

Observation:

  • A healthy 10-year-old boy presented with acute ethmoiditis and orbital cellulitis confirmed by computed tomography (CT).
  • Initial treatment with intravenous antibiotics led to clinical improvement.
  • The patient subsequently developed sudden vision loss with central scotoma and visual impairment to 0.05.

Findings:

  • Repeat CT and magnetic resonance imaging (MRI) revealed no orbital abscess.
  • Surgical intervention via ethmoidectomy also showed no evidence of abscess.
  • The blindness was attributed to optic neuritis secondary to ethmoiditis.

Implications:

  • This case underscores the possibility of vision loss from ethmoiditis even in the absence of a detectable orbital abscess.
  • Optic neuritis is a potential, albeit rare, cause of blindness in pediatric patients with acute ethmoiditis.
  • Prompt ophthalmologic evaluation is essential in cases of sudden visual changes during ethmoiditis treatment.