Astigmatism
In Astigmatism, an uneven curvature of the cornea blurs and distorts both distant and near objects. Normally, the cornea (front window of the eye) is round, with the same curvature along all axes/sides, rather like a football. The astigmatic cornea is shaped a little more like a rugby ball, curved more in one direction than in another. As a result, light rays from different meridians (axes) focus on separate areas of the retina, distorting the visual image.
Most people have very slight astigmatism, but a significant number require spectacle or contact lens correction to see clearly. Advances in laser techniques allow astigmatism to be corrected with
LASIK and LASEK. Wavefront guided techniques may also be beneficial