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
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.