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Related Concept Videos

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...
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...
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...
Diabetic Retinopathy01:27

Diabetic Retinopathy

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...
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...
Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies01:20

Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies

The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...

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Related Experiment Video

Updated: Jun 6, 2026

Primed Mycobacterial Uveitis (PMU) as a Model for Post-Infectious Uveitis
10:33

Primed Mycobacterial Uveitis (PMU) as a Model for Post-Infectious Uveitis

Published on: December 17, 2021

Ocular Tuberculosis Initially Presenting as Central Retinal Vein Occlusion.

Muiz Mahyudin1, May May Choo, Norlina Mohd Ramli

  • 1University Malaya Medical Centre, Kuala Lumpur, Malaysia.

Case Reports in Ophthalmology
|December 1, 2010
PubMed
Summary

Ocular tuberculosis, a rare condition, can mimic central retinal vein occlusion. Early diagnosis using polymerase chain reaction (PCR) is crucial for effective antituberculosis therapy and vision improvement.

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Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability
07:23

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability

Published on: August 6, 2021

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Last Updated: Jun 6, 2026

Primed Mycobacterial Uveitis (PMU) as a Model for Post-Infectious Uveitis
10:33

Primed Mycobacterial Uveitis (PMU) as a Model for Post-Infectious Uveitis

Published on: December 17, 2021

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability
07:23

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability

Published on: August 6, 2021

Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Microbiology

Background:

  • Central retinal vein occlusion (CRVO) is a common cause of vision loss.
  • Retinal vasculitis can be associated with various systemic and infectious causes.
  • Ocular tuberculosis is rare and often presents without systemic signs.

Observation:

  • A young man presented with CRVO that progressed to retinal vasculitis and severe vision loss.
  • Initial investigations, including Mantoux test and chest X-ray, were negative for tuberculosis.
  • Fundus fluorescein angiography confirmed retinal vasculitis, unresponsive to corticosteroid therapy.

Findings:

  • Polymerase chain reaction (PCR) analysis of vitreous fluid detected Mycobacterium tuberculosis.
  • This confirmed ocular tuberculosis as the underlying cause of the patient's symptoms.
  • A 6-month course of antituberculosis therapy led to inflammation subsidence and vision improvement.

Implications:

  • This case highlights the importance of considering tuberculosis in unexplained retinal vasculitis, even without systemic evidence.
  • PCR analysis of ocular fluids is a valuable diagnostic tool for ocular tuberculosis.
  • Prompt diagnosis and treatment of ocular tuberculosis can significantly improve visual outcomes.