If caused by refractive error, a visual acuity of 4.6 is needed to wear glasses to correct the refractive error and improve vision, but if caused by other eye diseases, glasses are not able to improve vision and glasses are usually not needed. A visual acuity of 4.6 is lower than a normal adult visual acuity of 5.0, which can cause the patient to have trouble seeing things at a distance. However, there are more causes for a visual acuity of 4.6, including refractive errors and other eye diseases, such as cataracts, glaucoma, and endophthalmitis. Patients with vision loss due to refractive error can improve their vision by wearing glasses to correct the refractive error. For vision loss caused by other reasons, even if wearing glasses, the vision may not be improved, so wearing glasses is not very meaningful, and timely treatment is needed, such as cataract patients can be treated with surgery to improve their vision. It is recommended that patients with vision loss should consult a hospital for evaluation of their condition and follow the doctor’s instructions for treatment.