Tags: Disease.
Posterior Ischemic Optic Neuropathy (PION) is a medical condition characterized by damage to the retrobulbar portion of the optic nerve due to ischemia a restriction of the blood supply to the optic nerve. Despite the term posterior this pathophysiology may be applied to cases where the ischemic damage is anterior as the condition describes a particular mechanism of visual loss as much as the location of damage in the optic nerve.