Nystagmus is generally referred to as eye tremor, which can be caused by a variety of factors, such as oculomotor, ophthalmologic, vestibular, congenital, and other factors. 1. Oculomotor factors: Oculomotor factors are usually due to the lesion of extraocular muscles, so the angle of the eyeball when rotating is large, which will cause eye tremor. 2. Ophthalmic factors: Patients suffering from ocular diseases may lead to visual impairment in the center of the macular position and abnormal visual function, which may lead to the inability to inject and cause eye twitching. 3. Vestibular factors: middle ear diseases, large and small brain vestibular center lesions, Meniere’s syndrome and other diseases can lead to vestibular function abnormalities, thus causing eye tremor. 4. Congenital factors: some patients’ eye tremor is congenital, usually found a few months after birth, and need to consider a certain relationship with heredity. 5. Other factors: hysteria, chemical stimulation, poisoning and other factors, may also lead to the emergence of voluntary eye tremor. The cause of eye tremor is very many reasons, after the symptoms should be timely to go to the hospital to improve the examination, a clear diagnosis, to give targeted treatment.