How does sleep crust not scratch your eyeball?

Question

How does sleep crust not scratch your eyeball?

In: Biology

Answer 1

Because, while it may be crusty, the side of it that is closest to your eyeball is less crusty than the part that is exposed to air.

Answer 2

because eyecrust is made from a bunch of water soluble proteins and salts. It forms when liquids on your eyes run out and dry up.