With 200 degree glasses, the vision is usually in the range of about 0.5-0.6. If the person is more compensated, he or she may see around 0.7; if the person is less compensated, the vision may only be around 0.2-0.3 vision. However, no matter what kind of vision, 200 degrees of myopia is usually recommended to be corrected with glasses, especially among children. Because this level of myopia is not low enough, not wearing glasses will make it difficult to see the blackboard and affect learning. In addition, it may also increase the probability of myopia growth, so for children, glasses are required for 200 degrees of myopia. Among adults, it is possible to not wear glasses if you feel your vision is sufficient. If you feel that you are struggling to see far away, you still need to wear a pair of glasses, even when you need them.