CHRNG and myopia: For this reason, we designed this pilot study in which the rs524952, rs8000973, rs1881492, rs1656404, rs235770, and rs7744813 SNPs of the GJD2, ZIC2, CHRNG, PRSS56, BMP2, and KCNQ5 genes, respectively, were analyzed and compared between responder and nonresponder patients who had undergone a two-year treatment with lenses for myopia control.