Astigmatism

Astigmatism

Astigmatism is a common vision condition that causes blurred vision. Like nearsightedness and farsightedness, astigmatism is a refractive error. It is not an eye disease or an eye problem, but rather a condition in which the eye does not focus light precisely on the retina (the light-sensitive tissue at the back of the eye). Characterized by an irregular curvature of the cornea, astigmatism usually is present at birth.