Astigmatism varies from one eye examination to the next and may be related to the state of the eye, the optometric equipment, or it may be an indication of an aggravation of the condition. Astigmatism is a common clinical refractive error, optometry is a kind of objective or subjective optometry, to determine the patient’s visual acuity status, including the presence of astigmatism. 1. Different eye status: astigmatism is not the same each time, may be because each time the patient’s eye status is different when the optometry examination, such as visual fatigue easily affect the results. 2. Optometry equipment is different: it may also be because each time the examination of the use of optometry equipment there is a certain degree of variability, which leads to the results of the examination and the previous error. 3. Aggravation of the condition: Astigmatism is different every time you take an eye test. It is also possible that the patient does not pay attention to the daily life management and does not cooperate with the doctor to actively treat the astigmatism, which results in the astigmatism aggravating gradually. To summarize, astigmatism patients need to pay attention to maintain good eye habits, strengthen eye care, go to a fixed hospital on time for review, and follow the doctor’s instructions when necessary.