Keratoconus, a progressive thinning of the cornea, is the most common corneal dystrophy in the U.S., affecting one in every 2000 Americans.
Keratoconus is more prevalent in teenagers and adults in their twenties. It arises when a focal area 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 (irregular astigmatism) and blurriness of vision. This eye disease may also cause sudden swelling and a sight-impairing scarring of the tissue.