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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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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...
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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, whereas...
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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: 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...

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Updated: May 7, 2026

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients
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Optic neuropathy in Behçet's syndrome.

Desmond P Kidd1

  • 1Department of Clinical Neurosciences, Royal Free Hospital, University College London, Pond Street, London, NW3 2QG, UK, d.kidd@ucl.ac.uk.

Journal of Neurology
|September 27, 2013
PubMed
Summary

Behçet's syndrome can cause inflammatory optic neuropathy, affecting vision. Most cases improve with steroid treatment, with visual acuity at its lowest point predicting the final outcome.

Area of Science:

  • Ophthalmology
  • Neurology
  • Rheumatology

Background:

  • Behçet's syndrome is a multisystem inflammatory disorder.
  • Optic neuropathy is a rare but serious ocular manifestation.

Purpose of the Study:

  • To describe the clinical characteristics of primary optic neuropathy in Behçet's syndrome.
  • To review treatment responses and outcomes in published cases.

Main Methods:

  • Case series of four patients with Behçet's syndrome and optic neuropathy.
  • Comprehensive literature review of all reported cases.
  • Analysis of clinical features, investigations, and treatment responses.

Main Results:

  • A total of 20 cases were identified, presenting as unilateral or bilateral inflammatory optic neuropathy.

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  • Optic disc swelling occurred in 45% of cases; pain in 20%.
  • Most cases responded to steroids, with or without immunosuppression; nadir visual acuity determined outcome.

    • Conclusions:

    • Primary optic neuropathy in Behçet's syndrome is treatable with immunosuppressive therapy.
    • Early treatment is crucial for preserving visual function.
    • Nadir visual acuity is a key prognostic indicator for visual recovery.