An overview of the optokinetic after nystagmus (OKAN) examination.

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The optokinetic after nystagmus (OKAN) examination is sensitive in detecting any imbalances in the vestibular system. OKAN examination is routinely perfomed on patients complaining of vertigo and dizziness at Juntendo University Hospital.The author noted a few problems in judging the directional preponderancy (DP) of the OKAN examination. In determining DP, several factors should be taken into account: maintainencc time of the first phase after nystamgus, frequency of nystagmus, second and third phase after nystagmus, and eye-speed in the slow phase of nystagmus. Many types of DP have been reported. Except for one case, DP and spontaneous nystagmus exhibited the same direction.While the OKAN examination is generally performed and considered very usual when spontaneous nystagmus is not present, it can also be used in cases where there is spontaneous nystagmus.
耳鼻咽喉科臨床学会の論文