Insufficient blood supply to the brain can affect the eyes, and patients can experience transient blackouts in one eye, as well as impaired consciousness, including quadrant blindness and hemianopia. Insufficient blood supply to the brain can be clinically divided into insufficient blood supply to the internal carotid artery system and insufficient blood supply to the vertebral basilar artery system. In the case of inadequate blood supply to the internal carotid artery system, patients can develop impaired blood supply to the ophthalmic artery, which is a branch of the internal carotid artery, and can affect the patient’s visual acuity. Insufficient blood supply to the brain can occur in young people or in middle-aged or elderly people. In the case of young people, most of them are caused by mental tension, stress, and sleep disorders, and should be treated mainly with psychological guidance to relax, reduce stress, and improve sleep, which may ease the symptoms. In the case of middle-aged and elderly people, most of the symptoms are caused by atherosclerosis, and patients often have a history of high blood lipids and high blood sugar, so the main treatment is to improve blood circulation and control risk factors at the same time. The main drugs to improve blood circulation are Shuxin, Cipro, and Ginkgo biloba drops; the main drugs to lower blood sugar are metformin, Reglanet, and also insulin can be applied; the drugs to lower blood lipids, generally commonly used in clinical practice, are simvastatin, resulvastatin, and atorvastatin.