Which eye-disorder arises due to difference in the radius of curvature of cornea in the different planes?

Astigmatism is a common and generally treatable imperfection in the curvature of your eye that causes blurred distance and near vision. Astigmatism occurs when light is bent differently depending on where it strikes the cornea and passes through the eyeball. An eye with astigmatism has a cornea that is curved more like a football, with some areas that are steeper or more rounded than others. This can cause images to appear blurry and stretched out.