Oblique axis astigmatism is astigmatism with an axial position between 30-60 degrees and 120-150 degrees. Oblique axis astigmatism is a type of astigmatism, which is a refractive error in the eye, where the lens or corneal surfaces are not curved in the same way, resulting in unclear or overlapping images on the retina. Astigmatism can be categorized into regular astigmatism and irregular astigmatism. Astigmatism can be corrected or treated with glasses or surgery. Astigmatism can be caused by both congenital and acquired factors. Congenital factors: Astigmatism has a family genetic predisposition, and the onset of astigmatism is characterized by a certain degree of family aggregation. If there are congenital developmental abnormalities in the cornea, the incidence of astigmatism will be very high. Acquired factors: long-term poor eye posture will stimulate the occurrence of astigmatism, if there is astigmatism will also make the symptoms further aggravated. Poor posture eye posture including lying or lying down to play cell phones, reading books, usually look at things habit squinting or squinting corner of the eye, will lead to eyelid pressure on the eye, affecting normal vision. Oblique-axis astigmatism has a greater impact on vision and usually requires prescription lenses to correct.