The cornea is one of the most important pieces to the structure of the eye. The cornea covers the functional parts of the eye, the iris, the anterior chamber, and the pupil. The cornea is clear and made up of cells and proteins. Interestingly, the cornea is one of the only tissues in the body that does not receive nourishment from blood vessels. Instead it is nourished by tears. It is transparent by design because the cornea refracts light.
The cornea also blocks foreign material like dust, bacteria and even water.
The cornea is made up of the epithilium, the bowman’s layer, stroma, descemet’s membrane, and endothelium each with their own important function.
Corneal transplants are necessary when the cornea is damaged or diseased. It is replaced entirely or in part by healthy corneal tissue from donors.