Considering T-cell subsets, CD3+ (PAN-T) cell% was, on average, inferior (p = 0.000) in the SCD HU− subgroup, and the same goes for CD4+ helper T-cell% (p = 0.032) and CD4+ naïve T-cell% (p = 0.021). This evidence concerns the gene CD4 and Schnyder corneal dystrophy.