Period Alternating Nystagmus

PAN Sakar

Patient looks straight ahead: spontaneous nystagmus, mainly horizontally to the left. 40 seconds: Changing of direction: nystagmus is now beating to the right. Intensity increases when the patient looks to the right (1 minute 5 seconds) and decreases when the patient looks to the left according to Alexander’s law. No significant change of intensity when the patient looks upward and downward (1 minute 30 seconds).

Patient looks straight ahead: spontaneous nystagmus, mainly horizontally to the left. 40 seconds: Changing of direction: nystagmus is now beating to the right. Intensity increases when the patient looks to the right (1 minute 5 seconds) and decreases when the patient looks to the left according to Alexander’s law. No significant change of intensity when the patient looks upward and downward (1 minute 30 seconds).