Nine pedigrees (P1–9) with CFEOM1 carried either the c.2860 C > T(p.Arg954Trp) or c.2861G > A(p.Arg954Gln) variant of KIF21A, and two pedigrees (P11–12) with CFEOM3 carried the c.2860 C > T(p.Arg954Trp) variant of KIF21A. One pedigree (P10) with CFEOM3 carried the c.784 C > T(p.Arg262Cys) pathogenic variant of TUBB3 (Fig. 1). Here, KIF21A is linked to congenital fibrosis of extraocular muscles.