Myopia 200 degrees is the degree of optometry, a few points indicates the degree of naked eye vision. For example, if two people with the same myopia of 200 degrees go to check their naked eye vision after taking off their glasses, one may be 0.4 and the other 0.2, and their visual acuity is not the same. Conversely, if two people with the same 0.4 go to check their visual acuity, they may also be different, and sometimes the difference is even larger, and the two are not equal. In some special cases, if you want to estimate the naked eye vision or myopia, about one line of the visual acuity table difference of 25-50 degrees, 200 degrees on the difference of four lines, compared with normal people, probably naked eye vision in 0.4, but this method is actually not accurate, and not too recommended to use.