Astigmatism is a common eye condition that is corrected by eyeglasses, contact lenses, or surgery. Astigmatism is characterized by unequal curvatures of the cornea. Astigmatism results in blurry vision and can occur in both nearsighted and farsighted persons, or it can be found alone.
A person's cornea is spherical in shape and when light enters the eye, the cornea refracts or bends light creating a clear image of the object. However, the eye of a person with astigmatism is shaped more like a football or the back of a spoon. For this person, when light enters the eye it is refracted more by one curve than the other, resulting in a blurry image.