How does astigmatism occur?

Astigmatism and myopia as well as farsightedness are refractive errors, astigmatism and genetic formation has a certain relationship, in addition to long-term continuous fatigue with the eye also has a relationship. Mainly due to cornea or lens, in a fixed axis on the performance of refractive error, resulting in objects can not be imaged on the retina, patients can show vision decline, need to go to the hospital after optometry examination can be clearly diagnosed astigmatism need to wear plastic glasses, so that the eye's corrected vision to normal, for astigmatism degree is relatively high, it is easy to form keratoconus. It is suggested to go to the hospital for examination in time after showing visual deterioration, wear glasses with appropriate degree, and develop good eye habits, which can control the continuous increase of degree. For those with stable degree, it can also be considered to change the degree through surgery.