Usually, the astigmatism means an irregular shape of cornea, accompanying a diagnosis of farsightedness or nearsightedness. Astigmatism may lead to many vision problems, and it usually results from the cornea shaped abnormally. Vision symptoms are usually unnoticeable in mild cases of astigmatism. However, in more severe cases, astigmatism not only causes difficulties to see clearly, but also causes symptoms such as red eyes, eye fatigue, fluctuating vision, and many other side effects such as eyes swollen, eye pain, watery eyes, headaches,sore eyes after squinting, etc. These side effects will appear especially after long time of reading a book, staring at a computer screen, or looking off into the distance. Therefore, to correct and relive the symptoms of astigmatism, you can simply by wearing prescribed glasses or corrective contact lenses, or you can receive refractive surgery if necessary.