With the eyes in the primary position, no nystagmus is seen.
• Ask the patient to follow your finger in all the principal directions of gaze with the finger 60 cm from him and both eyes open.
• Have him do it again with one and then the other eye closed.
• Repeat the above with the finger close enough to the patient to make him converge while he looks in all the principal directions.
Nystagmus elicited from any of these procedures will be described as, for example, "bilateral left beating nystagmus on left lateral gaze," or whatever eye position is necessary to evoke it.
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