Astigmatism results from an anatomical defect in which the cornea or the lens has a shape of a rugby ball. This would make the rays focus on two or many focal points which leads to a blurred vision.
Astigmatism is a refractive error that leads to a general visual difficulty from short or long distances. Focusing is often difficult and objects tend to have outlines that are not always well-defined. Fortunately, like other visual defects such as short-sightedness, long-sightedness, and presbyopia, this refractive error can also be corrected.