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Initial evaluation for the nystagmus. (A) Right six cranial nerve palsy when the patient looked to the right side. (B) No response in caloric test due to vestibular suppressant medication. (C) Gaze-induced nystagmus (right beating nystagmus looking to right side and left beating nystagmus looking to left side). (D) Normal saccade test. (E) Normal pursuit test. (F) Abnormal optokinetic eye movement in both directions. L: left, R: right, deg: degree, s: second, Hz: Hertz.
