VSX1 and keratoconus: One study in a population of Southern India failed to detect VSX1 abnormalities in patients with KC, although it detected four SNPs: c.546A>G rs12480307, c.627+23G>A rs6138482, c.627+84T>A rs56157240, and c.504-24C>T (IVS3-24C) [58].