The purpose of this study is to investigate the long-term safety, tolerability and efficacy of neramexane mesylate in the treatment of congenital idiopathic nystagmus (CIN). In addition, a subgroup of multiple sclerosis (MS) patients suffering from acquired nystagmus will be included.
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Long-term safety, Visual acuity
Timeframe: Baseline, week 4, month 3, 6, 9, 12, 18, 24, 30, 36 and follow-up