FRMD7 and ocular albinism: Mutations in the genes coding for GPR143 and FERM domain-containing 7 (FRMD7), both found on the X-chromosome, have been linked to congenital nystagmus, one of features of ocular albinism that can occur as a non-syndromic condition (Han et al., 2015; Michaud et al., 2019; Wang et al., 2021).