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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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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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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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Related Experiment Video

Updated: Oct 18, 2025

Intravitreal Injections in the Ovine Eye
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[Paraneoplastic ophthalmopathies].

Z Böcskei1, E Viinikka2, L Dormegny2

  • 1Service d'ophtalmologie, hôpitaux universitaires de Strasbourg, 1, quai Louis-Pasteur, 67000 Strasbourg, France; Service de neurologie, hôpitaux universitaires de Strasbourg, 1, avenue de Molière, 67200 Strasbourg, France.

Journal Francais D'Ophtalmologie
|October 2, 2021
PubMed
Summary
This summary is machine-generated.

Ophthalmologists must recognize rare ocular paraneoplastic syndromes, which can signal severe systemic disease. Early diagnosis and management, focusing on cancer and immune treatments, are crucial for patient outcomes.

Keywords:
ImmunotherapyImmunothérapieNeuro-ophtalmologieNeuro-ophthalmologyNeuropathies optiquesOptic neuritisParaneoplasticParanéoplasieRetinitisRétinitesUveitisUvéopathies

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Area of Science:

  • Ophthalmology
  • Neurology
  • Oncology

Background:

  • Ocular paraneoplastic syndromes are uncommon conditions affecting any eye structure.
  • Manifestations can occur at any age and may indicate severe, life-threatening systemic diseases.

Purpose of the Study:

  • To emphasize the importance of ophthalmologist familiarity with ocular paraneoplastic syndromes.
  • To highlight the neuro-ophthalmological and occasional anterior segment/uveal tract involvements.
  • To stress the need for suspicion in patients with comorbidities.

Main Methods:

  • Review of clinical presentations and diagnostic considerations for ocular paraneoplastic syndromes.
  • Emphasis on the diagnostic link between ocular symptoms and underlying systemic or neurologic conditions.
  • Discussion of current management strategies.

Main Results:

  • Neuro-ophthalmological manifestations, including optic nerve, retina, and eye movement pathway involvement, are most common.
  • Anterior segment, orbit, and uveal tract involvement can also occur.
  • Non-specific ocular signs coupled with systemic or neurologic comorbidities warrant heightened suspicion.

Conclusions:

  • Ocular paraneoplastic syndromes require prompt recognition and management by ophthalmologists.
  • Effective treatment involves addressing the primary oncologic condition and associated immune responses.
  • Familiarity with these syndromes is essential due to their potential to reveal serious underlying pathologies.