Involuntary swaying of the eyeballs from side to side is medically known as nystagmus. It may be related to physiological and pathological causes, such as albinism, congenital cataract, etc. 1. Physiological causes: For example, the sudden stimulation of the external ear canal by cold or hot water irrigation can affect the eye muscles and nerves, resulting in transient nystagmus, which usually recovers on its own without treatment. 2. Pathological causes: (1) Albinism: due to the abnormalities of the body’s laminase enzyme, caused by the lack of melanin in the skin, resulting in impaired visual input impulses, the patient will be prone to nystagmus after seeing light. (2) Congenital cataract: often caused by congenital genetics or developmental disorders, nystagmus may be caused by retinal or refractive media lesions. When nystagmus occurs, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.