There is no clear statement or definition of the highest degree of astigmatism that can be achieved. Astigmatism caused by physiological normal growth and development process is below 100 degrees, which will not have a big impact on vision, and most of them do not need to be corrected. Astigmatism above 100 degrees can significantly affect the patient’s vision, and the patient can wear glasses to correct the astigmatism and improve vision. When the patient has cone cornea and other pathological conditions, the disease causes the patient’s astigmatism to show a continuous progression of the state, serious cone cornea or corneal scar patients can even appear thousands of degrees of astigmatism, advanced cone cornea is difficult to be corrected through the general wearing of lenses and other ways, if necessary, need to carry out corneal transplantation treatment. It is recommended that patients with astigmatism consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.