What is the uncorrected vision of 0.1?

Uncorrected vision 0.1, this means that his vision is not good. But vision is not good, there are many reasons, such as cornea, lens, fundus, etc. There is also a common reason is refractive error, if it is refractive error problem, the approximate degree may be around 250, as for the specific number of degrees? Also varies from person to person, some of the impact may be relatively large 200 degrees on 0.1, some of the impact is relatively small, may be 500 degrees also 0.1, so say how many degrees, to be accurate through medical optometry. The above health science knowledge is for reference only, the specific situation needs to be checked in a regular hospital, judged by a professional doctor.