Related Experiment Videos

[The uvea and crystalline lens: toxicity of new medications]

P Lefebvre1

  • 1Service d'Ophtalmologie, Hôpital Erasme, Université Libre de Bruxelles, Bruxelles. pierre.lefebvre@ulb.ac.be

Insights

New medications can harm eye tissues, including the uvea and crystalline lens. This review examines drug-induced ocular inflammation and lens lesions, highlighting both new and older agents with potential toxicity.

Area of Science:

  • Ophthalmology
  • Pharmacology
  • Toxicology

Context:

  • The pharmaceutical industry continuously introduces new therapeutic agents with diverse delivery methods.
  • All pharmaceutical agents possess the potential to induce ocular tissue damage.
  • The World Health Organization (WHO) provides criteria for assessing the certainty of drug-adverse reaction relationships.

Purpose:

  • To review inflammatory lesions of the uvea and crystalline lens induced by currently available medications.
  • To discuss newly developed pharmacologic agents and re-evaluate older medications for ocular toxicity.
  • To update the literature on the known or suspected toxicity of certain drugs on the uvea and crystalline lens.

Summary:

  • This article systematically reviews ocular inflammatory lesions, specifically uveitis and crystalline lens damage, associated with pharmaceutical agents.
  • It examines both novel and established medications, referencing historical reports of ocular toxicity from 1972.
  • The review emphasizes the importance of recognizing and understanding drug-induced ocular side effects, particularly those affecting the uvea and lens.

Impact:

  • Provides essential information for ophthalmologists and pharmacologists regarding drug-induced ocular toxicity.
  • Contributes to patient safety by raising awareness of potential adverse reactions to medications.
  • Facilitates informed prescribing decisions by detailing the ocular risks associated with various therapeutic agents.

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...
Ophthalmic Drug Delivery Systems01:23

Ophthalmic Drug Delivery Systems

Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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...
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...
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...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...