AstigmatismWhen the cornea has an irregular or elongated shape, light will fail to come into sharp focus on the retina, and multiple focal points will be produced. Some of the light will come into focus before the retina, some behind it and some even on the retina itself. The result, just as with nearsightedness or farsightedness, is poor visual acuity.

Astigmatism: The cornea is shaped more like a football than a baseball, resulting in two or more focal lines that focus in front, behind or on the retina.