The cause of keratoconus is unknown.

Keratoconus may be associated with:

  • Vigorous rubbing of your eyes
  • Other eye conditions, including retinitis pigmentosa, retinopathy of prematurity or vernal keratoconjunctivitis
  • A combination of several disorders, such as enzyme abnormalities or hereditary factors including Down syndrome
  • Wearing contact lenses for several years
Feb. 20, 2013