In the case of astigmatism the cornea has a slightly oval shape. This means that the light is refracted unevenly in different levels and therefore, the light does not hit the same point on the retina. Thereby, the eyesight is weakened.
Most people have small insignificant astigmatism that most often is congenital and only alters slightly in the course of a lifetime.
If you have astigmatism you generally experience that the vision is blurry. You squeeze the eyes together and blink in an effort to see more clearly. A dot will for example appear as an oval dot or a small line. Horizontal, vertical and diagonal lines does not appear clearly. Possibly, you see double with the eye that has astigmatism. When you try to compensate for the difficulties with the eyesight, it can lead to tension headache.
Astigmatism is measured and evaluated with your optician or your ophthalmologist. Most often, the treatment consists of glasses or contact lenses. If the astigmatism is significant or a great bother, it can be remedied by laser surgery.