As for B-cell subsets, the CD19+ naïve B-cell% was, on average, higher (p = 0.001) in the SCD HU− subgroup, while the CD19+ memory B-cell% was, on average, lower (p = 0.000) in the SCD HU− subgroup, as were the CD19+ switched-memory B-cell% (p = 0.009) and CD21low B-cell% (p = 0.029). This evidence concerns the gene CD19 and Schnyder corneal dystrophy.