TFRC and Schnyder corneal dystrophy: The mean values of transferrin and the log (sTfR)/log (ferritin) index were within the normal range (2–5 g/L and ≥1.5, respectively) in children with SCD (4.1 g/L and 5.9, respectively) whereas both were above the upper limit of normal values in the control group (6.9 g/L and 1.8, respectively).