It is not advisable to determine the degree of myopia based on naked eye vision. If the patient needs to determine the degree of myopia, an optometric examination is required. Although the higher the degree of myopia, the more obvious the decrease in naked-eye vision, the correlation between the degree of myopia and naked-eye vision is not very clear, there is no one-to-one relationship. Moreover, there are many factors affecting naked eye vision, such as myopia, astigmatism, abnormal retinal function, etc., which may greatly affect a person’s vision and make the patient’s naked eye vision decrease. Although poor naked eye vision usually occurs in patients with more severe myopia. However, some people have strong adjustment of the lens, etc., and the naked eye vision may not correspond linearly to the degree of myopia. If people want to know the degree of their eyes, they need to go to the hospital for optometry examination. Patients with vision loss are advised to seek prompt medical attention to assess their condition and follow the doctor’s instructions.