Nystagmus in the left eye is caused by cold water in the right ear; warm water would cause it on the other side. Warmth goes to the same as cold, and vice versa.
Your sense of balance and hearing are both mediated by the vestibulocochlear nerve, cranial nerve eight. Although this nerve is not responsible for controlling eye movement, a loss in it might make balance so unstable that nystagmus results. Vestibular dysfunction results from damage to the vestibular system brought on by illness, viral infection, high dosages of some antibiotics, stroke, deterioration of the inner ear's balance function, hits to the head (such as concussions, brain trauma, whiplash), or some other unidentified cause (s).
Thus, we can conclude that cold water in the right ear causes nystagmus in the left eye while warm water would do so on the opposite side. Cold and warmth are equivalent, and vice versa.
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