In Tanzania, only sickling test was commonly available at all facilities (RRH and MNH), which is similar to other hospitals in Africa where screening for SCD is done using the sickling test and solubility test that are unreliable and cannot distinguish homozygous (Hb SS) from heterozygous (Hb AS) state (United Republic of Tanzania, 2017). The gene discussed is GSTM1; the disease is Schnyder corneal dystrophy.