Health - rapid involuntary eye jiggling (nystagmus)

[Gallisa]

Swim has popped e many times. And everyonce and awhile he gets really bad eye jiggling. It doesn't really worry him but it becomes very annoying when trying to watch a movie or talk to people. He notices more when he is looking at something and quickly looks somewhere else. Then his eyes jiggle side to side and then go back to normal. On erowid.org they list that as a neutral side affect. Label it as rapid, involuntary eye jiggling (nystagmus). Has anyone else had this? Is it bad? Swims only thought is that it is a sign that his brain is being fried. He really has no clue.