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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...
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...
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...
Local Anesthetics: Common Agents and Their Applications01:23

Local Anesthetics: Common Agents and Their Applications

Local anesthetics (LAs) are commonly used for various applications in medical and dental procedures. Some of the common agents used are cocaine, lidocaine, and bupivacaine.
Cocaine is an ester of benzoic acid and methylecgogine. It is used to anesthetize and vasoconstrict locally. Currently, it is used primarily for topical applications. It is beneficial for surgeries on the upper respiratory tract, providing anesthesia and shrinking the mucosa. Cocaine in the form of cocaine hydrochloride is...
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...
Cholinergic Antagonists: Pharmacokinetics01:24

Cholinergic Antagonists: Pharmacokinetics

Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and the conjunctiva.

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Related Experiment Video

Updated: Jun 20, 2026

Ultrasound Cyclo Plasty in Eyes with Glaucoma
05:05

Ultrasound Cyclo Plasty in Eyes with Glaucoma

Published on: January 26, 2018

[Antiglaucoma drops--with or without preservatives].

M Zemba1

  • 1Spitalul Clinic de Urgenţa Militar Central Bucureşti.

Oftalmologia (Bucharest, Romania : 1990)
|August 25, 2009
PubMed
Summary
This summary is machine-generated.

Preservatives in glaucoma eye drops can cause adverse reactions. This article discusses avoiding complications and compares preserved versus unpreserved options for glaucoma treatment.

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Last Updated: Jun 20, 2026

Ultrasound Cyclo Plasty in Eyes with Glaucoma
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Area of Science:

  • Ophthalmology
  • Pharmacology

Context:

  • Glaucoma management frequently involves topical medications.
  • Preservatives are common in multi-dose eye drop formulations.

Purpose:

  • To outline adverse reactions associated with preservatives in glaucoma eye drops.
  • To explore strategies for mitigating these complications.
  • To present a comparative analysis of preserved and unpreserved eye drop formulations.

Summary:

  • Common adverse reactions to preservatives in glaucoma eye drops include ocular surface toxicity and inflammation.
  • Strategies to avoid complications involve preservative-free formulations or alternative administration methods.
  • Both preserved and unpreserved eye drops have distinct advantages and disadvantages regarding efficacy, safety, and cost.

Impact:

  • Informing clinical decisions regarding the selection of appropriate glaucoma eye drop formulations.
  • Improving patient adherence and outcomes by minimizing treatment-related side effects.
  • Highlighting the importance of preservative-free options for sensitive patients or those on long-term therapy.