NDP and Abnormal retinal morphology: Since the severity of retinal disease in the reported cases of FEVR and Norrie disease considered in this review form a continuum rather than a bimodal distribution, and since the mechanism of disease is fundamentally the same (NDP mutation) in each case, we propose it is justifiable to combine Norrie disease and FEVR into a single group and then stratify patients based on the severity of vitreoretinal disease described in each case report.