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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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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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Open Angle Glaucoma: Treatment01:27

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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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Inhaled Medications01:23

Inhaled Medications

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Inhaled medications are crucial for managing chronic obstructive pulmonary disease (COPD) and asthma. They are essential for effective treatment and control, ensuring optimal respiratory health and well-being. Inhaled medication delivers drugs directly to the lungs, providing a rapid onset of action and reducing systemic side effects compared to oral or injectable medications. Three primary types of inhalation devices are used to administer these medications: nebulizers, metered-dose inhalers...
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Angle Closure Glaucoma: Treatment01:28

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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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Infective endocarditis management involves a multifaceted approach encompassing infection prevention, lifestyle modifications, pharmacological therapy, and surgical management.Infection Prevention:Hand Hygiene: Thorough handwashing is crucial to prevent the spread of infection. Hand hygiene should be performed regularly, especially before and after using the restroom.Oral Hygiene: Good oral hygiene is essential. It includes brushing teeth immediately after waking up and before bed, flossing...
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Myocarditis III: Medical Management

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Related Experiment Video

Updated: Feb 8, 2026

Ultrasound Cyclo Plasty in Eyes with Glaucoma
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Preservatives in glaucoma medication.

David W Steven1, Pouya Alaghband2, Kin Sheng Lim3

  • 1Department of Ophthalmology, Eerste River and Groote Schuur Hospitals, University of Cape Town, Cape Town, South Africa.

The British Journal of Ophthalmology
|July 6, 2018
PubMed
Summary
This summary is machine-generated.

Preservative-free glaucoma drops are not essential for all patients. Benzalkonium chloride (BAK) preserved drops show no clear harm in patients without ocular surface disease (OSD).

Keywords:
BAKbenzalkonium chlorideglaucomaocular surface disease (OSD).preservatives

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Area of Science:

  • Ophthalmology
  • Pharmacology

Background:

  • Benzalkonium chloride (BAK) is a common ophthalmic preservative, but preservative-free (PF) alternatives for glaucoma are emerging.
  • While animal and some clinical studies suggest BAK toxicity, robust evidence from randomized controlled trials (RCTs) is limited.

Purpose of the Study:

  • To evaluate the necessity of preservative-free glaucoma medications.
  • To assess the clinical significance of BAK toxicity in ophthalmic preparations.

Main Methods:

  • Review of existing literature, including in vitro, in vivo, non-randomized controlled studies, and limited published RCTs comparing BAK-preserved and PF formulations.
  • Analysis of studies focusing on ocular surface disease (OSD) and polypharmacy.

Main Results:

  • Published RCTs comparing BAK-preserved and PF glaucoma drops have not demonstrated clear benefits of PF formulations.
  • Limited evidence suggests no clinically significant harm from BAK in patients without OSD, though studies often exclude this group or are short-term.

Conclusions:

  • Preservative-free glaucoma medications may be beneficial for patients with OSD or on polypharmacy.
  • Routine recommendation of more expensive PF drops for all glaucoma patients is not supported by current evidence.