A child’s visual acuity of 0.2 is equivalent to about 200-300 degrees of myopia, but the exact degree of myopia can only be accurately determined after an optometric examination. The visual acuity of 0.2 refers to the visual acuity, while the degree of wearing glasses usually refers to the refractive error, clinically there is no equivalent relationship between the visual acuity and refractive error can be converted. In other words, 0.2 vision is caused by myopia, hyperopia or astigmatism. If it is caused by myopia, the visual acuity is about 300 degrees. The eye has the ability to adjust itself, even if the visual acuity is the same, there is still a big difference in the degree of myopia, so it is necessary to go through an optometry to be able to determine the exact degree of myopia. When myopia occurs, you need to wear glasses with the right prescription to correct it under the guidance of your doctor, do not use your eyes for a long time, and go to the hospital for regular eye checkups.