Ischaemic optic neuropathy (ION) is
the commonest adult optic nerve disorder encountered worldwide and can be
expected to increase in incidence in our ageing population. The condition hasbeen classified as a) anterior (AION) affecting the optic nerve head and b)
posterior (PION) involving that portion of the optic nerve behind its immediate
retrolaminar portion.
Further more there are two pathological varieties of the
disease c) Arteritic (AAION) almost exclusively associated with Giant CellArteritis (GCA) and d) Nonarteritic (NA-AION or less correctly NAION) usually
associated with diabetes, hypertension and hypercholesterolaemia. A recent
treatise on the subject runs to more than 600 pages.
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