What is the definition or description of: papilledema?

Swollen optic nerve: The flat appearing main nerve to the back of the eye similar to a telephone trunk line or cable becomes swollen. This is usually a sign of brain problems or something pushing on the eye behind it this is like stepping on a garden hose and having the fluid back up. The flat nerve head becomes indistinct and there are usually splinter hemorrhages in the retina the blood vessels appear raised/swollen.

Swelling of nerve: Papilledema is swelling of the optic nerve that is caused increased pressure around the brain.