Naked eye visual acuity refers to the visual acuity table situation that can be seen without wearing glasses. Normal people have a bare eye vision of about 1.0 or more than 1.0, and even if it fluctuates slightly, once in a while the vision can go to about 0.8, it is considered normal vision. If the visual acuity is significantly lower than normal, or the difference between the two eyes is relatively large, you need to go to the hospital for a detailed examination. The first thing you need is an optometric examination to find out if you have myopia, hyperopia or astigmatism. If you have these conditions, you can consider wearing glasses, and if you achieve improved vision, it is a refractive problem. If the vision does not improve with glasses, consider organic pathology, such as cataracts or fundus pathology in the elderly. If such lesions are present, surgery or laser treatment may be required to resolve the problem.