Myopic astigmatism refers to the degree of myopia in a certain axis, more than the entire sphere, manifested as astigmatism, blurred vision, myopic astigmatism is generally divided into cis-ruled astigmatism, retro-ruled astigmatism, oblique axis astigmatism, irregular astigmatism, etc., as follows: 1, cis-ruled astigmatism: that is, the axial direction of astigmatism is around 180 degrees, cis-ruled astigmatism is normal axial astigmatism, can be corrected by wearing astigmatic lenses; 2, retro-ruled astigmatism: refers to This kind of astigmatism may be extremely uncomfortable with glasses, and may easily produce fatigue, eye pain and other symptoms; 3, oblique axis astigmatism: refers to the astigmatism of about 45 degrees, generally related to genetics, symmetrical in both eyes; 4, irregular astigmatism: may be caused by inflammation, trauma and other factors.