In the same context, Sahebjada and colleagues [39] have also attempted to study the association between KC and five of these CCT-associated SNPs which include rs1324183 (MPDZ-NF1B, chr9:13557491), rs1536482 (RXRA-COL5A1, chr9:137440528), rs2721051 (FOXO1, chr13:41110884), rs7044529 (COL5A1, chr9:137568051) and rs9938149 (BANP-ZNF49, chr16:88331640). This evidence concerns the gene COL5A1 and keratoconus.