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Global Journal of Otolaryngology severity of such impairment varies widely. Also, many blind people have nystagmus, which is one reason that some wear dark glasses. VariationsCentral nystagmus: It occurs as a result of either normal or abnormal processes not related to the vestibular organ. For example, lesions of the midbrain or cerebellum can result in upand down-beat nystagmus.Peripheral nystagmus: It occurs as a result of either normal or diseased functional states of the vestibular system and may combine a rotational component with vertical or horizontal eye movements and may be spontaneous, positional, or evoked.Gaze Induced nystagmus: Itoccurs or is exacerbated as a result of changing one's gaze toward or away from a particular side which has an affected vestibular apparatus.Positional nystagmus: It occurs when a person's head is in a specific position. An example of disease state in which this occurs is Benign paroxysmal positional vertigo (BPPV).Post rotational nystagmus: It occurs after an imbalance is created between a normal side and a diseased side by stimulation of the vestibular system by rapid shaking or rotation of the head. Spontaneous nystagmus:It is nystagmus that occurs randomly, regardless of the position of the patient's head. Physiologic nystagmusPhysiologic nystagmus is a form of involuntary eye movement that is part of the vestibulo-ocular reflex (VOR), characterized by alternating smooth pursuit in one direction and saccadic movement in the other direction.

Principle a) Body rotation results from the unbalanced static activity of the two end organs

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