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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...
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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...
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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...
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Related Experiment Video

Updated: Jul 13, 2026

Induction of Ocular Surface Inflammation and Collection of Involved Tissues
06:38

Induction of Ocular Surface Inflammation and Collection of Involved Tissues

Published on: August 4, 2022

Introducing the Blood-Tear Barrier: Structure, Function, and Disruption in Ocular Surface Homeostasis.

Marlies Gijs1, Li Liang1, Fleur Goezinne2

  • 1University Eye Clinic Maastricht, Mental Health and Neuroscience Research Institute (MHeNs), Maastricht University, Maastricht, the Netherlands.

Progress in Retinal and Eye Research
|July 11, 2026
PubMed
Summary

The blood-tear barrier (BTB) selectively controls what enters the tear film from blood vessels. This review models the BTB's structure and discusses its protective roles and how it can be disrupted.

Keywords:
Blood-Tear BarrierConjunctivaCorneaLacrimal glandOcular SurfaceTear FilmTear Fluid

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Area of Science:

  • Ophthalmology
  • Physiology
  • Molecular Biology

Background:

  • Tear fluid composition differs from blood, implying a selective blood-tear barrier (BTB).
  • The BTB's structure, function, and disruption mechanisms are poorly understood.
  • Existing literature suggests a BTB regulates molecular exchange between ocular vasculature and tear film.

Purpose of the Study:

  • To propose a conceptual model of the blood-tear barrier (BTB).
  • To review the BTB's structure, functional roles, and disruption mechanisms.
  • To highlight the importance of BTB integrity for ocular surface health.

Main Methods:

  • Literature review and synthesis of current evidence.
  • Development of a conceptual model for the BTB.
  • Analysis of factors affecting BTB integrity.

Main Results:

  • The BTB is proposed to consist of three compartments: tear film, epithelial layer, and vascular endothelium.
  • Tight junctions are central to maintaining BTB integrity.
  • The BTB provides bidirectional protection, shielding the eye and limiting blood-derived factor entry.

Conclusions:

  • The BTB plays a crucial role in ocular surface protection.
  • Disruption of the BTB can occur due to various factors like surgery, drugs, and diseases.
  • Further understanding of the BTB is vital for ocular health and disease management.