Cornea - Definition

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The cornea is a transparent and fibrous membrane, domed shape, which constitutes the eyeball's anterior portion. It is located under the conjunctiva (thin protective membrane), and just in front of the iris and the pupil.


The cornea plays the role of a natural lens by transmitting light rays to the eye, and reflects or retracts. It is not vascularized and feeds oxygen tears and atmosphere as well as the aqueous humor in the anterior part.


Some malformations and diseases may affect the cornea, including the following: