There is no quantitative correspondence between myopia and visual acuity, and there is no way to accurately project myopia based on naked eye vision. Under normal circumstances, the visual acuity of a person’s eyes is above 5.0. If the visual acuity is 4.5, it means that the patient is experiencing vision loss and should go to the ophthalmology department of the hospital for an optometry examination to determine the presence of myopia and the exact degree of myopia. After determining your refraction, choose the appropriate method to correct your vision. Myopia is usually related to bad eye habits and genetic factors. Patients can control the progression of myopia by improving eye habits and reasonable exercise. However, vision loss can also be caused by other diseases, cataract, retinal detachment and so on can also lead to vision loss, not only myopia can lead to vision loss. It is recommended that patients with vision loss should consult a doctor promptly to assess their condition and follow the doctor’s instructions for treatment.