There is no conversion relationship between visual acuity and myopia, and there is no direct relationship between visual acuity and refractive error, so it is not possible to extrapolate what the visual acuity of a patient with 200 degrees of myopia is. Myopia can lead to vision loss, generally the higher the degree of myopia, the worse the patient’s naked eye vision, but there is no one-to-one quantitative relationship between the degree of myopia and visual acuity. However, there is no one-to-one quantitative relationship between myopia and visual acuity. Therefore, the specific myopia of a patient cannot be inferred based on the number of degrees of myopia, and even for the same 200 degrees of myopia, the visual acuity of different patients may be different. Visual acuity refers to the minimum separable visual acuity of the eye. The visual acuity chart reflects the minimum angle of view of the subject looking at the target at two separate points, including central vision, peripheral vision and stereoscopic vision. Diseases such as myopia, cataracts, glaucoma and so on can lead to loss of visual acuity of the patient. Patients with vision loss are advised to consult a doctor promptly to assess their condition and take treatment under the doctor’s guidance.