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Related Concept Videos

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...
Microbiome of the Eye01:22

Microbiome of the Eye

The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...
Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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...
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...
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...

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Related Experiment Video

Updated: May 23, 2026

Nasolacrimal Lavage as a Treatment for Ocular Surface Toxic Soup Syndrome
03:40

Nasolacrimal Lavage as a Treatment for Ocular Surface Toxic Soup Syndrome

Published on: April 25, 2025

Dry eye syndrome.

Mohammad-Ali Javadi1, Sepehr Feizi

  • 1Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Journal of Ophthalmic & Vision Research
|March 29, 2012
PubMed
Summary
This summary is machine-generated.

Keratoconjunctivitis sicca (KCS), or dry eye syndrome, is now understood as a complex condition involving inflammation and gland dysfunction, not just insufficient tears. This evolving understanding drives the development of better treatments for dry eye disease.

Keywords:
Dry Eye SyndromesKeratoconjunctivitis Sicca

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Area of Science:

  • Ophthalmology
  • Immunology

Background:

  • Keratoconjunctivitis sicca (KCS), or dry eye syndrome, was previously attributed solely to aqueous tear deficiency.
  • Recent research reveals KCS as a multifactorial disorder with complex underlying causes.

Purpose of the Study:

  • To summarize the evolving understanding of the pathophysiology of dry eye syndrome.
  • To highlight the shift from a singular cause to a multifactorial model of KCS.

Main Methods:

  • Review of recent scientific literature on dry eye syndrome.
  • Analysis of the changing paradigm in KCS etiology.

Main Results:

  • KCS etiology is now recognized to involve ocular surface inflammation, lacrimal gland inflammation, neurotrophic deficiency, and meibomian gland dysfunction.
  • This multifactorial understanding represents a significant paradigm shift in dry eye research.

Conclusions:

  • The updated understanding of KCS pathophysiology has spurred the development of novel and more effective therapeutic interventions.
  • Further research into the interplay of these factors is crucial for advancing dry eye treatments.