The occipital lobe is located in the posterior part of the brain, accounting for a small part of it, and its physiological functions are related to vision. Occipital lobe infarction mainly causes visual impairment, and if bilateral occipital lobe infarction occurs, it can produce cortical blindness. Cortical blindness is when the patient shows total blindness and can’t see anything, but the pupil-to-light reflex exists, which is relatively rare. If one side of the occipital lobe is infarcted, the typical case can produce hemianopia, which is manifested as isotropic hemianopia of the contralateral visual field, while the central vision is not affected, a condition called macular evasion. In fact, the blood supply to the occipital lobe mainly comes from the posterior cerebral artery, due to the large number of vascular variants and large differences in compensation of the collateral circulation. Patients have complex and diverse clinical symptoms, which can be manifested as blurred vision, visual distortion, visual field defects, visual seizures, visual loss of recognition, etc.