This clear structure focuses light rays onto the retina.
A normal cornea is round and smooth like a basketball. With astigmatism, the cornea has a steeper curve in one direction—like a football.
Light enters the cornea and focuses sharply on the retina. With astigmatism, light bends in different directions as it enters the eye, hitting the retina in more than one place.
Astigmatism may make vision blurry or distorted. Symptoms
Astigmatism is an irregular shape of your cornea or lens that makes objects appear blurry or unfocused.
See how changing the shape of the cornea affects your vision.