Unilateral blurred vision due to internal carotid artery occlusive disease

The eye globe is a very specialized organ and internal carotid artery (ICA) provides blood supply of eye via ophthalmic artery which is the first intracranial branch of the ICA.1 In ICA occlusive disease (ICAOD), the blood flow in the ophthalmic artery reverses to supply the ipsilateral brain due to incomplete blood circulation at Willis polygon and this phenomenon called as “steal phenomenon”.2 Reduction in perfusion pressure of the ophthalmic artery and its branches especially central retinal artery and posterior ciliary artery, lead the decreased retinal and choroidal circulation and chronic progressive ocular ischemia.3