4.3 What is the exact degree of vision?

4.3 vision can only indicate that standing at a distance of 5 meters, you can see the position of 4.3 on the eye chart, which only represents how much uncorrected vision is, and how many degrees are asymmetrical. Because 4.3 can only indicate that you can see 4.3, the specific number of degrees must be optometry. After the examination, it looks like diopter, which may be myopia, hyperopia, and astigmatism. The diopter is the diopter obtained by refraction, which is the result of the refractive curvature of cornea and lens, and is not completely symmetrical with the eye chart. Therefore, it is impossible to judge whether myopia or hyperopia, or astigmatism, etc. according to naked vision.