Carotid artery system ischemia syndrome alias: 1, carotid artery insufficiency syndrome; 2, carotid artery insufficiency syndrome; 3, carotid artery obstruction syndrome. Summary: The main features are temporary loss of vision in one eye, contralateral hemiparesis or hemianesthesia, aphasia and mental disturbance. As the early signs of vascular obstructive diseases often appear in the changes of fundus, the obstruction of branches of carotid artery may cause corresponding changes of retinal artery, especially the retinal artery pressure is reduced, indicating low pressure of carotid artery, thus suggesting that the obstructive disease originates from carotid system. It is mostly seen in men and develops between the ages of 50-70. Etiology: caused by a variety of reasons, such as microscopic emboli (cholesterol crystals, fibrin or platelet coagulation clots, etc.), nonspecific arteritis, artery compression by masses or scarring and atherosclerotic plaques, etc. Ocular features: transient painless loss of vision on the affected side (this is the prominent feature of the syndrome), transient burning sensation in the eye and tear overflow. Photopia, hemianopia. Retinal vascular infarction, shiny cholesterol spots in the retinal arteries, optic nerve atrophy. V. Systemic features: 1. Often sudden transient cerebral ischemia, contralateral upper and lower limb weakness, hemianesthesia, mental confusion and speech impairment. 2. Occasional headache, vertigo, and epileptic-like seizures. VI. Treatment: Etiological treatment, such as post-ball injection of compound camptothecin II and simultaneous injection in the affected carotid artery side, has significant effect on improving circulation.