Astigmatism is a refractive irregularity of the eye that is related to the curvature of the cornea. Astigmatism can cause vision loss, visual fatigue, compensatory head position and squinting, etc. With the development of electronic technology, astigmatism can usually be determined through electronic optometry. Astigmatism can be divided into light, medium, heavy and high, if the test astigmatism is 150 degrees, it belongs to moderate astigmatism. 1. Mild astigmatism: Astigmatism below 100 degrees is generally physiological astigmatism, most of which does not affect vision and does not require treatment. But adolescents need to pay attention, if it affects the vision, to correct in time, wear glasses. 2, moderate astigmatism: astigmatism between 100-200 degrees, in the clinical most of the patients in this range, easier to correct, so more than 100 degrees of astigmatism should be treated in a timely manner. 3, severe astigmatism: generally between 200-300 degrees, the treatment may be more complicated and will take longer than moderate astigmatism. 4, high astigmatism: generally the astigmatism degree is above 300 degrees, it is the most serious kind, it is difficult to correct by wearing glasses, and the corneal condition allows to consider surgery treatment. Astigmatism if there are symptoms such as visual fatigue, blurred vision, regardless of the size of the astigmatism should be corrective treatment, astigmatism 150 degrees belongs to moderate myopia, if there is visual impairment, it must be corrected in a timely manner. Otherwise, the astigmatism may continue to rise, and the treatment will be more complicated.