FYB1 and Schnyder corneal dystrophy: The poor representation of Africans or individuals of African descent in the Belgian donor pool (predominantly consisting of individuals of European descent in whom the prevalence of Fyb antigen is high) greatly complicates the search for compatible pRBC units for an SCD patient in whom the presence of anti-Fy3 alloantibodies restricts compatibility to individuals of African ethnicity [20].