If you want to know whether you have astigmatism or not, you can find out through daily performance, visual acuity examination and optometry examination. 1. Daily performance: When astigmatism occurs, people often have blurred vision, double vision, and are prone to visual fatigue, especially after prolonged vision, which may cause dizziness and headache. In addition, people with astigmatism usually squint, habitually tilt their heads and other actions, especially in the darker light vision loss is more obvious. 2. Visual acuity examination: When you suspect that you have astigmatism, you can go to the hospital for a visual acuity examination, which is helpful in assessing the ability of the eyes to focus on objects at different distances, thus assisting in the diagnosis of whether astigmatism exists. 3. Optometry: The main purpose of optometry is to use computerized optometers to examine the eyes, through which it is helpful to obtain the presence of astigmatism, as well as the axis of astigmatism, the number of degrees and other important parameters. When astigmatism-related symptoms appear, consult a doctor as soon as possible and take active corrective measures.