Two patients complaining of visual loss and hemorrhage were given a diagnosis of ocular ischemic syndrome (OIS) due to extracranial carotid artery disease by visual loss and hemorrhage of the fundus. OIS is defined as a disease with chronic ocular ischemic change, which can be diagnosed based on retinal tone and fluorescein fundus angiography. One patient underwent carotid endarterectomy (CEA) and the other underwent subclavian artery-common carotid artery bypass using the greater saphenous vein graft. Both patients recovered their eyesight in the early postoperative period. Patients with OIS also have general comorbid diseases; however, surgical treatment was thought to be effective unless a patient was at high risk. Because postoperative brain hemorrhage and high eye pressure could be critical, they should be monitored and controlled in consultation with ophthalmologists. The two patients with OIS achieved sufficient blood flow restoration to the ocular region, resulting in a good outcome. CEA or carotid artery reconstruction was effective for these two patients with OIS due to extracranial carotid artery disease.