Nystagmus is involuntary, repetitive, rhythmic eye movements in horizontal, less often in a vertical or rotary directions. Nystagmus consists of slow one way and fast in the other side components. A correct assessment of the nystagmus is important for diagnosis and prognosis of diseases of the ear labyrinth (see Vestibulometry), cerebellum and other Nystagmus is investigated by means of the visual fixation finger doctor put forward in the direction from temple patient 15-20 cm, in turn in both directions.