There are many reasons for astigmatism in patients, which may be caused by poor growth and developmental eye habits, as well as conical cornea, corneal trauma and the formation of scarring. During the growth and development of the eye, due to the compression of the upper and lower eyelids as well as gravity and other factors, most people have an imbalance in which the radius of curvature in the vertical direction is smaller than that in the horizontal direction, and astigmatism due to this type of condition is more common. Other conditions such as genetically related conical corneas and corneal scarring due to trauma can also cause astigmatism to occur and are generally more severe. Astigmatism can lead to loss of vision and may also manifest as double vision. It is recommended that patients with astigmatism consult a doctor in a timely manner for evaluation and rejection. In most cases, the corneal surface is still uneven, but the unevenness of the corneal surface can be counteracted and restored to flatness due to the filling of the tear coverage, etc. This part of the case does not lead to the manifestation of astigmatism.