Astigmatism is an imperfection in the curvature of the eye's cornea or lens that causes blurred vision at all distances
. In a perfectly shaped eye, the cornea and lens have a round curvature, like the surface of a smooth ball. However, in astigmatism, the surface is egg- shaped, causing light to focus in front of the retina, making distant objects seem blurry. Astigmatism is often present at birth and may occur in combination with nearsightedness or farsightedness. It is a common and generally treatable condition that can be corrected with eyeglasses, contact lenses, or surgery
