If your Eye M.D. suspects arteritic AION — the more dangerous form of AION — he or she may use a diagnostic test called fluorescein angiography, in which a dye is injected and a series of rapid photographs are taken, to help confirm the blockage of blood flow to the optic nerve.

Your Eye M.D. may also order additional tests to rule out giant cell arteritis (GCA), which is often associated with arteritic AOIN, including blood work and biopsies of arteries in the temple area of the head.

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