Corneal Diseases

Question 1

What are the 5 layer of the cornea?

Answer 1

-Outermost-
Tear film
Epithelium
Stroma
Descements mem.
Posterior epithelium(endothelium)
-Innermost-

Question 2

Which layer of the cornea contains preoteinases, natural proteinase inhibitors, growth factors and cytokine and is therefore important in normal corneal epithelial cell turnover & would healing?

Answer 2

Tear film

Question 3

The epithelial layer is _______, therefore will have no stain uptake in a normal, non-ulcerated eye.

Answer 3

Hydrophobic

Question 4

If there is a + fluorescein stain with “smooth” appearance, which layer took up the stain and which layer has the ulcer?

Answer 4

Stroma(hydroPHILIC) uptakes the stain because of a break(ulcer) in the epithelium

Question 5

At which layer do keratocytes convert to fibroblasts to heal it and therefore has more scar formation?

Answer 5

Stroma

-makes up 90% of corneal thickness