What is papilledema?

Optic nerve swelling: Due to increased intracranial pressure. Papilledema can cause permanent damage to one's vision if the intracranial pressure is not lowered to a normal level.

Papilledema : Papilledema is swelling of the optic nerves due to high spinal fluid pressure in the brain.

Papilledema is: a swollen optic nerve head. The term papilledema should be reserved for optic disc swelling that is due to raised intracranial pressure such as brain tumor or head trauma.