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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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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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Drugs such as carbonic anhydrase inhibitors, α2- and...
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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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The Rodent Model of Nonarteritic Anterior Ischemic Optic Neuropathy (rNAION)
06:49

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Drug-induced optic neuropathies.

Michael J Lloyd1, Frederick W Fraunfelder

  • 1Casey Eye Institute, Portland, Oregon, USA.

Drugs of Today (Barcelona, Spain : 1998)
|January 5, 2008
PubMed
Summary
This summary is machine-generated.

Toxic optic neuropathy, often caused by medications like amiodarone, ethambutol, linezolid, and sildenafil, can lead to vision loss. Early identification and drug withdrawal are key for potential vision recovery.

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Area of Science:

  • Ophthalmology
  • Toxicology
  • Pharmacology

Background:

  • Optic neuropathy involves optic nerve damage from ischemic, hereditary, nutritional, or toxic causes.
  • Toxic optic neuropathy can result from non-medicinal compounds or adverse drug reactions.
  • Commonly prescribed drugs like amiodarone, ethambutol, linezolid, and sildenafil are associated with optic nerve disease.

Purpose of the Study:

  • To review commonly prescribed medications linked to optic neuropathy.
  • To highlight the importance of recognizing drug-induced optic neuropathy for timely diagnosis and treatment.
  • To provide guidelines for screening and managing drug-induced optic neuropathies.

Main Methods:

  • Literature review focusing on drugs with available data and frequent adverse reactions.
  • Analysis of agents including amiodarone, ethambutol, linezolid, and sildenafil.
  • Synthesis of information on screening and management strategies.

Main Results:

  • Several commonly prescribed medications can cause toxic optic neuropathy.
  • Prompt identification and withdrawal of the offending agent are crucial for treatment.
  • Awareness among practitioners is essential for patient care.

Conclusions:

  • Drug-induced optic neuropathy is a significant clinical concern.
  • Timely referral and accurate diagnosis depend on practitioner awareness.
  • Management focuses on identifying and discontinuing the causative agent.