Most of the adolescent patients are in the stage of physical growth, the body is still relatively healthy, adolescents after a long period of squatting action, the body’s blood circulation with the rise and rise of some changes. The common factor is to consider the uneven distribution of blood, resulting in transient cerebral blood supply insufficiency, cerebral blood supply insufficiency caused by insufficient cerebral blood supply to both eyes, resulting in transient ischemia, thus causing the performance of the two eyes black, usually after a period of time to change the position, the symptom will generally be relieved. In this case, we need to observe whether it occurs frequently or transiently, if it occurs frequently, we suggest the patient to go to the neurology department for diagnosis and treatment, so as to exclude some diseases at an early stage.