IN CLINICAL otoneurology electronystagmography (ENG) has proved to be an extremely useful diagnostic method. It not only may render a diagnosis more certain but also may reveal additional information otherwise unobtainable.
Electronystagmography has many interesting functions, which may be summarized as follows: (1) analysis, (2) detection, (3) measurement, and (4) documentation.
Abnormal eye movements, both spontaneous or induced, occur in a wide variety of disorders, and the ability to record them is of considerable help in their analysis.True nystagmus must be distinguished from other types of eye movement. It is not always possible to make this distinction with a high degree of certainty on direct visual observation. Figures 1-3 show some abnormal eye movements which might superficially have been mistaken for nystagmus, but on analysis proved not to be.
It is not at all infrequent that nystagmus may be recordable when it is not visible, either by
HART CW. The Role of Nystagmography in Clinical Diagnosis. Arch Otolaryngol. 1966;84(6):631–633. doi:10.1001/archotol.1966.00760030633007
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