The purpose of this study is to investigate the safety and efficacy of neramexane mesylate in the treatment of congenital idiopathic nystagmus (CIN) in comparison to placebo. In addition, a subgroup of multiple sclerosis (MS) patients suffering from acquired nystagmus will be included; this subgroup will be analyzed in an exploratory manner only.
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Visual acuity
Timeframe: Screening, Baseline, Week 3, 7, 11, 14, 18, and Follow-up