Editing Cornea

'''Cornea''' is the transparent front part of the eye that covers the [[iris]], [[pupil]], and [[anterior chamber]]. The cornea, with the [[anterior chamber]] and [[lens]], refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power.

== Anatomy ==

The human cornea has a diameter of about 11.5 mm and a thickness of 0.5–0.6 mm in the center and 0.6–0.8 mm at the periphery. Transparency, avascularity, the presence of immature resident immune cells, and immunologic privilege makes the cornea a very special tissue.

== Function ==

The cornea contributes to the eye's ability to focus by refracting light as it enters the eye. The cornea is responsible for 65-75% of the eye's total focusing power. When light strikes the cornea, it bends--or refracts--the incoming light onto the lens. The lens further refocuses that light onto the retina, a layer of light sensing cells lining the back of the eye.

== Diseases and disorders ==

There are many diseases that can affect the cornea, including [[keratitis]], [[keratoconus]], [[corneal ulcer]], [[Fuchs' dystrophy]], and [[Lattice dystrophy]]. These diseases can cause pain, blurred vision, tearing, redness, and extreme sensitivity to light.

== Treatment ==

Treatment for corneal disease can take many forms, depending on the underlying problem. Some conditions resolve with the use of medicated eye drops. When the disease is more deeply seated, a [[corneal transplant]] may be needed.

== See also ==

* [[Eye]]
* [[Human eye]]
* [[Ophthalmology]]

[[Category:Anatomy]]
[[Category:Ophthalmology]]
[[Category:Eye]]

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<gallery>
File:Cornea.png|Cornea
File:Vertical_section_human_cornea-Gray871.png|Vertical section of human cornea
File:SD-OCT_Corneal_Cross-Section.png|SD-OCT Corneal Cross-Section
File:Human_eye_with_limbal_ring,_anterior_view.jpg|Human eye with limbal ring, anterior view
File:-66wiki.jpg|Cornea
File:Cornea.jpg|Cornea
</gallery>