Causes And Diagnoses

Causes and Diagnoses of Keratoconus

The exact cause of keratoconus isn’t known, but a number of cases appear to be hereditary. Research is also underway to study the connection between keratoconus and other inflammatory diseases. Other causes may include:

  • Corneal trauma
  • Chronic eye inflammation and rubbing
  • A history of ill-fitting contact lenses
  • Enzyme imbalance in the cornea

Diagnosing keratoconus

Your physician can diagnose keratoconus with an eye exam that may include:

  • Visual acuity test: This common eye chart test measures vision ability at various distances using a series of lenses.
  • Pupil dilation: The pupil is widened with eye drops to allow a close-up examination of the eye's lens and retina.
  • Tonometry: This standard test determines the pressure (intraocular pressure, or IOP) inside the eye.
  • Keratometer: This device measures the curvature of surface of your cornea.
  • Keratoscope: This device projects a series of concentric rings onto the cornea to identify distortions of the corneal surface.
  • Corneal topography (photokeratoscopy): This imaging test maps the curvature of your cornea.