<prompt> Ocular hallmark of giant cell aeritis isPapilloedemaCRAOAIONCRVO  <response>: Answer- C. AIONThe most common ocular manifestation of giant cell aeritis is visual loss, most commonly secondary to anterior ischemicoptic neuropathy AION due to occlusion of sho posterior ciliary aerities.Ophthalmic aery involvement can lead to sudden blindness which is the most feared complication of temporal aeritis. 