Astigmatic eyes have blurred vision, double vision, and varying degrees of visual fatigue when looking at things. An example of astigmatism is drawing a cross on a white sheet of paper with a pen. A nearsighted person would need to wear a 300-degree myopic lens to see the horizontal line clearly, and a 400-degree myopic lens to see the vertical line clearly. This condition of only being able to see in one direction is a sign of astigmatic vision. The problem with this kind of eye is that you cannot see both horizontal and vertical lines clearly with the same degree of myopic glasses: when you see the horizontal line clearly, the vertical line becomes blurred; when you see the vertical line clearly, the horizontal line becomes blurred again. To correct this kind of astigmatism, you need to add a 100 degree myopic astigmatism glasses in addition to the 300 degree myopic glasses. After wearing these astigmatic glasses, the horizontal and vertical lines can be seen clearly. People who have farsightedness will also have astigmatism, the symptoms are the same, only more likely to occur visual fatigue. In summary, people with astigmatism, no matter how to adjust, can not make the blurred image everywhere clear, when looking at things will be more difficult to see objects in detail, can only maintain a certain direction of the object relatively clear, some directions (such as horizontal direction) is easier to identify, while some other directions are more difficult to identify.