Five congenital nystagmus loci have been mapped including autosomal dominant NYS2 on chromosome 6p12 [2] (OMIM 164100), autosomal dominant NYS3 on chromosome 7p11.2 (OMIM 608345) [3], autosomal dominant NYS4 on chromosome 13q31-q22 (OMIM 193003) [4], and X-linked NYS1 on chromosome Xp11.4-p11.3 [5] (OMIM 310700) and Xq26-q27 [6]. This evidence concerns the gene FRMD7 and congenital nystagmus.