Sudden blurred eyes, blurred vision, and dizziness may be a result of inadequate blood supply to the brain. Inadequate blood supply to the brain is divided into inadequate blood supply to the internal carotid artery system and inadequate blood supply to the vertebral basilar artery system. Insufficient blood supply to the internal carotid artery system can cause impaired blood supply to the ophthalmic artery, and patients may experience blurred eyes, as well as sensory and motor impairment in the lateral limbs. Inadequate blood supply to the vertebral basilar artery system can cause dizziness, nausea, vomiting, balance disorders and ataxia. The majority of cerebral insufficiency occurs in middle-aged and elderly people, patients usually have a history of atherosclerosis, and patients may have diabetes and hyperlipidemia. If a patient has these conditions, he or she should promptly check the neck vascular ultrasound, blood lipids and blood glucose, and if there is atherosclerosis, antiplatelet aggregation therapy should be given, along with treatment to improve blood circulation. Anti-platelet aggregation therapy is mainly applied to aspirin; drugs to improve blood circulation can be applied to Cipro and Ginkgo biloba drops. If the patient has hyperlipidemia, oral statins, such as simvastatin, resevastatin and atorvastatin, can be used to regulate lipids. If the patient has diabetes mellitus, the main treatment is oral metformin to lower sugar, if necessary, you can also add Bystolic and Repaglinide, and subcutaneous injection of insulin can also be treated when the blood sugar is high.