Keratoconus is a progressive thinning of the cornea. This condition is the most common corneal dystrophy in the U.S., affecting 1in every 2,000 Americans. It is more prevalent in teenagers and adults in their 20s. Keratoconus is when the middle of the cornea thins and gradually bulges outward, forming a rounded cone shape. This abnormal curvature changes the cornea’s refractive power, producing moderate to severe distortion (astigmatism) and blurriness (nearsightedness) of vision. Keratoconus may also cause swelling and a sight-impairing scarring of the tissue.
For all of the NEI information on this topic, please visit the following webpage:
Facts About the Cornea and Corneal Disease, Keratoconus
For information from other health sites, please visit the following webpages:
Medline Plus, Keratoconus
Cleveland Clinic Foundation, Keratoconus
National Keratoconus Foundation