How many degrees is reading glasses suitable?

The wearing degree of presbyopia glasses is not fixed, except for different presbyopia degrees and different viewing distances. Generally speaking, the degree of glasses according to age means that the object is 30 cm away from the eyes, which is the most comfortable and clear. In application, the degree is higher for small objects near, and lower for large objects far away. For example, when I look at my mobile phone, I usually wear 300-degree glasses. When I look at the computer screen, the distance is about 1 meter, which is suitable for 50 degrees, and when I am 70 cm, it is suitable for 100 degrees. If it is exchanged, it will not be used at all, and it will be bad for your eyes after a long time. Therefore, it is best to choose glasses with different degrees according to different scenes. Ordinary glasses are not expensive now, so buy more glasses with different degrees!