Astigmatism is a relatively common eye condition involving an irregular curvature of the cornea. Many people have some degree of astigmatism on top of nearsightedness or farsightedness, even if it’s only minor. Physical irregularities in the cornea cause distortion of the viewed image on the retina. As a result, vision becomes blurred or doubled at any distance, and can lead to eye discomfort and headaches. Today, LASIK can correct astigmatism by reshaping the cornea as well.