http://www.allaboutvision.com/conditions/keratoconus.htm Day 335 has 37 protein-coding genes (browser view) including VSX1 (visual system homeobox 1).
VSX1 is a homeobox gene involved in eye development. Mutations cause keratoconus.
Click here to see all 8055521 letters of Day 335 with VSX1 underlined.