The PNP levels in the patients with SCD correlated positively with LDH (r = 0.6032, p < 0.0001, Figure 1D) and platelet counts (r = 0.2543, p = 0.0461, Figure 1F), and negatively with haemoglobin (r = −0.4523, p = 0.0002, Figure 1E). The gene discussed is PNP; the disease is Schnyder corneal dystrophy.