PAX6 and fleck corneal dystrophy: FCD Type II is characterized by the expression of undifferentiated markers in BC including Sox2, Oct4, Pax6, Tbr1, Otx1, and others (Hadjivassiliou et al., 2010; Orlova et al., 2010; Arai et al., 2012; Yao et al., 2016).