Cornea

The cornea is the clear outer covering of the eyeball. The cornea protects the eye from many external agents. It has a different function from the eye’s lens, which deals with focus. There are various corneal symptoms and corneal disorders. Read more about: Cornea Symptoms, Cornea Disorders, Eye Disorders

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The cornea is the eye’s outermost layer. It is the clear, dome-shaped surface that covers the front of the eye.

Although the cornea may look clear and seem to lack substance, it is a highly organized tissue. Unlike most tissues in the body, the cornea contains no blood vessels to nourish or protect it against infection. Instead, the cornea receives its nourishment from tears and the aqueous humor (a fluid in the front part of the eye that lies behind the cornea).

Source: NEI (NIH)1

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Cornea: The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous Corneal Epithelium; Bowman Membrane; Corneal Stroma; Descemet Membrane; and mesenchymal Corneal Endothelium. It serves as the first refracting medium of the eye. It is structurally continuous with the Sclera, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the Trigeminal Nerve via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed)2

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References

  1. Source: NEI (NIH): nei.nih.gov/ health/ cornea
  2. Source: MeSH (U.S. National Library of Medicine)
  3. Source: NEI (NIH): nei.nih.gov/ health/ cornea

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.