Glossary of Terms

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endothelium -  The endothelium is the extremely thin, innermost layer of the cornea. Endothelial cells are essential to keep the cornea clear. Normally, fluid leaks slowly from inside the eye into the stroma. The endothelium's primary task is to pump this excess fluid out of the stroma. Without this pumping action, the stroma would swell with water, become hazy, and eventually opaque. Once endothelium cells are destroyed by disease or injury, they are lost forever. If a person loses too many endothelial cells, he or she might need a corneal transplantation.
epithelium - 

This is the outermost layer of the cornea that blocks foreign material, such as dust, water, and bacteria, from entering the eye and provides a smooth surface that allows the cornea to get nutrients from tears. The epithelium is filled with thousands of tiny nerve endings that make the cornea very sensitive to pain.

exudative -  In this type retinal detachment, fluid leaks into the area underneath the retina, but there are no tears or breaks in the retina. This type is usually caused by retinal diseases, including inflammatory disorders and injury or trauma to the eye.