Two novel missense substitutions in the VSX1 gene: clinical and genetic analysis of families with Keratoconus from India May 11, 2015 BMC Medical Genetics 2015, 16:33Â doi:10.1186/s12881-015-0178-x Govindasamy Kumaramanickavel and Jeyabalan Nallathambi contributed equally to this work. Published: 12 May 2015