Vision loss is a common symptom that can be caused by many ophthalmologic diseases, and the current loss of vision in the right eye to 4.8 is moderate vision loss. However, it is not possible to determine the cause of vision loss based on the symptoms. The causes of vision loss include refractive errors and cataracts. After a visit to the ophthalmology department of a hospital, the specific cause can usually be diagnosed, and then corrected and treated accordingly. For refractive errors, vision can be improved by wearing glasses; for cataracts, surgical treatment is needed to improve vision. In the absence of a clear diagnosis, it is not recommended that patients blindly carry out treatment on their own, as the condition may be delayed if the symptoms are not correct, and even the health of the eyes may be affected by the adverse effects of treatment.