This cytokine and IFN-γ had an inverse relationship with SCD levels (r = −0.55, p < 0.05 and r = −0.69, p < 0.001, respectively) and ME activity (r = −0.59, p < 0.01 and r = −0.52, p < 0.05, respectively). This evidence concerns the gene IFNG and Schnyder corneal dystrophy.