It is not possible to determine the patient’s myopia from the patient’s visual acuity of 0.1; there is no one-to-one quantitative relationship between the two. Because there is no clear quantitative relationship between visual acuity and myopia, it is difficult to assess myopia from a patient’s visual acuity. Each person’s ability to adjust near and far is different, especially in children, and the difference in ciliary muscle regulation is even greater, so the same visual acuity of 0.1 may result in a greater difference in myopia from patient to patient. In addition, low vision can be caused not only by refractive error, but also by other causes of vision loss, such as cataract, glaucoma, and fundus hemorrhage. In order to determine the degree of myopia, patients need to go to the hospital for an optometry examination. Patients with vision loss are advised to seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.