CC is the usual (‘non‐variant’) allele at CLCN6. The SNP, CT or TT, at CLCN6 (rs9651118), was significantly associated with KC, HR 1.50, p < 0.00061, 95% CI 1.17–1.91, Bonferroni correction p value 0.001 (time to event analysis, time to first KC, Cox regression). This evidence concerns the gene CLCN6 and keratoconus.