Posterior ischaemic optic neuropathy (P. I. O.N. )

Abstract

A case of posterior ischaemic optic neuropathy (P.I.O.N.) is presented. The diagnosis is supported from the clinical presentation, visual field defects, fluorescein angiography and ophthalmodynamometric findings. The syndrome of posterior ischaemic optic neuropathy as opposed to anterior ischaemic optic neuropathy is discussed and the different blood supply to these parts of the optic nerve is emphasized.