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Related Concept Videos

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...
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...
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...
Muscles of the Eye01:20

Muscles of the Eye

The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and rotating...
Disorder of Water Balance01:29

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Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
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Related Experiment Video

Updated: Jun 4, 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

The watery eye.

Jianhua Wang1, Meixiao Shen, Lele Cui

  • 1Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami, Miami, FL 33136, USA. jwang3@med.miami.edu

Current Allergy and Asthma Reports
|February 9, 2011
PubMed
Summary
This summary is machine-generated.

This study explores human tear dynamics, focusing on the tear meniscus and tear film. Findings reveal how these change throughout the day and with interventions like punctual occlusion and contact lens wear.

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Area of Science:

  • Ophthalmology and Vision Science
  • Biomedical Engineering

Background:

  • The ocular surface requires constant lubrication for comfort, clear vision, and health.
  • Tear dynamics, including the tear meniscus and tear film, are crucial for maintaining ocular surface homeostasis.

Purpose of the Study:

  • To investigate diurnal variations in human tear dynamics.
  • To examine the effects of punctual occlusion and contact lens wear on tear meniscus and tear film.
  • To briefly discuss recent advancements in relevant imaging techniques.

Main Methods:

  • Observational study analyzing tear dynamics.
  • Utilized advanced imaging techniques to assess tear meniscus and tear film characteristics.
  • Monitored changes throughout the day and under specific conditions (occlusion, contact lenses).

Main Results:

  • Demonstrated significant diurnal variations in tear meniscus height and tear film stability.
  • Observed alterations in tear film parameters following punctual occlusion and during contact lens wear.
  • New insights into the dynamic nature of the ocular tear film.

Conclusions:

  • Tear dynamics are complex and influenced by daily activities and interventions.
  • Understanding these dynamics is vital for managing ocular surface conditions.
  • Further research using advanced imaging can enhance knowledge of ocular surface health.