Tear film
Tear film is a thin layer of fluid that covers the surface of the cornea and conjunctiva, serving to lubricate, nourish, and protect the eye. It is composed of three layers: the lipid layer, the aqueous layer, and the mucin layer.
Composition[edit | edit source]
The tear film is composed of three layers:
- The lipid layer is the outermost layer of the tear film. It is produced by the Meibomian glands and helps to prevent the evaporation of the tear film.
- The aqueous layer is the middle layer of the tear film. It is produced by the lacrimal glands and provides hydration and nutrients to the cornea and conjunctiva.
- The mucin layer is the innermost layer of the tear film. It is produced by the goblet cells of the conjunctiva and helps to spread the tear film evenly over the surface of the eye.
Function[edit | edit source]
The tear film serves several important functions:
- It provides lubrication, reducing friction between the eyelid and the cornea.
- It nourishes the cornea and conjunctiva, providing them with essential nutrients.
- It protects the eye from foreign bodies and infections.
- It helps to maintain the smooth optical surface of the cornea, which is essential for clear vision.
Disorders[edit | edit source]
Disorders of the tear film can lead to a variety of eye conditions, including dry eye syndrome, blepharitis, and conjunctivitis. Treatment for these conditions often involves addressing the underlying tear film disorder.
See also[edit | edit source]
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| Uvea/vascular tunic (middle) |
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| Retina (inner) |
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Contributors: Prab R. Tumpati, MD
