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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...
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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...
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...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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Related Experiment Video

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Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage
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Antioxidant defenses in the ocular surface.

Ying Chen1, Gaurav Mehta, Vasilis Vasiliou

  • 1Molecular Toxicology and Environmental Health Sciences Program, Department of Pharmaceutical Sciences, University of Colorado Denver, Aurora, CO 80045, USA.

The Ocular Surface
|December 2, 2009
PubMed
Summary

The human eye faces oxidative stress from daily exposure. Antioxidants in the ocular surface, including the tear film and cornea, protect against this damage and maintain eye health.

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Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage
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Area of Science:

  • Ophthalmology
  • Biochemistry
  • Oxidative Stress Research

Background:

  • The human eye is constantly exposed to oxidative stress from environmental factors like sunlight and internal metabolic processes.
  • Reactive oxygen species (ROS) contribute to ocular damage, making the eye vulnerable to oxidative stress.
  • The ocular surface, comprising the tear film, cornea, and aqueous humor, acts as a primary defense against free radicals.

Purpose of the Study:

  • To review the properties and functions of key antioxidants present in the ocular surface.
  • To highlight the role of the ocular surface antioxidant defense system in maintaining redox homeostasis.
  • To discuss the protective mechanisms against oxidative damage in the eye.

Main Methods:

  • Literature review of scientific articles and research papers.
  • Analysis of studies focusing on ocular surface biochemistry and antioxidant properties.
  • Synthesis of information on metabolic enzymes and small molecules acting as antioxidants.

Main Results:

  • The ocular surface is rich in various antioxidants, including metabolic enzymes and small molecules.
  • These antioxidants play a crucial role in neutralizing reactive oxygen species.
  • The integrated antioxidant system is vital for protecting ocular tissues from oxidative damage.

Conclusions:

  • The antioxidant defense system of the ocular surface is essential for maintaining eye health.
  • Understanding these antioxidants is key to developing strategies against oxidative eye diseases.
  • The review underscores the importance of redox homeostasis in ocular surface protection.