Parents often ask us why some children with nystagmus tilt their heads and some do not, and why their eyes turn in different directions. Why do I have to see a neurologist and an ENT when my child has an eye problem? It all has to do with the type of nystagmus. So what are the types of nystagmus? Mainly divided into: I. Physiological nystagmus 1. Terminal nystagmus: when both eyes are extremely externally and internally rotated; 2. Optokinetic nystagmus: when a moving object passes in the visual field or when I gaze at a fixed object during rapid travel; 3. Evoked nystagmus: given the vestibular function examination, available rotation, hot and cold, optokinetic and other stimuli —- are horizontal jumping nystagmus; 4. Psychogenic nystagmus: triggered by sudden induced by mental stimulation, transient horizontal oscillatory nystagmus can occur; 5. Random nystagmus: individual normal people can have short-lived horizontal pendulum-type nystagmus at random or autonomously, and individual can be vertical and rotational nystagmus, mostly high-frequency small amplitude nystagmus. Pathological nystagmus: 1, congenital idiopathic nystagmus – congenital nystagmus; 2, oculogenic nystagmus: mostly visual impairment nystagmus, followed by oculomotor light paralysis and occupational nystagmus; 3, vestibular nystagmus: mainly refers to vestibular nystagmus, also known as otogenic nystagmus or vagal nystagmus, which is caused by lesions of the inner ear and vestibular nerve. This type of nystagmus is mostly horizontal and horizontal rotation, mostly horizontal beating type nystagmus, and in rare cases, bilateral cochlear damage at the same time, and pendulum type nystagmus and head bobbing. The salient features of this type of nystagmus are a combination of severe vertigo and hearing impairment. This is different from the vertigo caused by central vestibular disease, which has a long duration but a mild degree of vertigo; 4. Central nystagmus: mainly central vestibular nystagmus is due to the central part of the vestibular system including the vestibular nucleus, cerebellum, vestibular center of the cerebral cortex, and brainstem). The resulting nystagmus can be seen as horizontal, rotational, vertical, variable and irregular in amplitude, or coarse or inconspicuous. The clinical manifestations are complex and inconsistent. Patients with this type of nystagmus have other manifestations of CNS pathology, and vertigo symptoms are usually not as pronounced as those of vestibular peripheral nystagmus, and some do not even have vertigo.