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Related Concept Videos

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...
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...
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...
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...
Diabetic Retinopathy01:27

Diabetic Retinopathy

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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Related Experiment Video

Updated: Jun 11, 2026

Establishment of A Mouse Model of Aqueous Deficiency Dry Eye
05:21

Establishment of A Mouse Model of Aqueous Deficiency Dry Eye

Published on: November 1, 2024

Dry eye disease.

Fabiana de Pinho Tavares1, Raphael Stehling Fernandes, Taliana Freitas Bernardes

  • 1Centro da Visão de Belo Horizonte, Brazil. fabianadepinho@gmail.com

Seminars in Ophthalmology
|July 2, 2010
PubMed
Summary

Dry eye disease (DED) is a common condition causing ocular discomfort and vision problems due to inflammation and tear film instability. This review covers DED causes, diagnosis, and treatments.

Area of Science:

  • Ophthalmology
  • Ocular Surface Disease

Background:

  • Dry eye disease (DED) is a multifactorial condition impacting ocular surface health.
  • It presents with discomfort, visual disturbances, and tear film instability.
  • DED is a prevalent clinical issue in ophthalmology, significantly affecting patient quality of life.

Purpose of the Study:

  • To provide a comprehensive overview of dry eye disease.
  • To discuss the etiology, classification, and diagnostic methods for DED.
  • To review current clinical and surgical treatment strategies for dry eye.

Main Methods:

  • This is a review article.
  • It synthesizes information on the pathophysiology of DED.
  • It covers diagnostic procedures and therapeutic interventions.

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Last Updated: Jun 11, 2026

Establishment of A Mouse Model of Aqueous Deficiency Dry Eye
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Establishment of A Mouse Model of Aqueous Deficiency Dry Eye

Published on: November 1, 2024

Clinical Application of Intense Pulsed Light Therapy and Radio Frequency for Treatment of Ocular Surface Diseases
07:36

Clinical Application of Intense Pulsed Light Therapy and Radio Frequency for Treatment of Ocular Surface Diseases

Published on: July 3, 2025

Main Results:

  • Dry eye disease involves complex mechanisms including inflammation and hyperosmolarity.
  • Accurate diagnosis relies on a combination of clinical signs and patient symptoms.
  • A range of treatments, from conservative to surgical, are available.

Conclusions:

  • Dry eye disease is a significant ocular condition with diverse causes.
  • Effective management requires understanding its multifactorial nature.
  • This review offers insights into current diagnostic and therapeutic approaches for DED.