The hemoglobin phenotype patterns were Hb FA 72.9% (n = 5492) and FAS 20.5% (n = 1546), followed by the predominant SCD phenotypes of Hb FS 1.6% (n = 118) and FSC < 0.1% (n = 8). Here, GSTM1 is linked to Schnyder corneal dystrophy.