Visual acuity 4.7 is measured by the logarithmic visual acuity scale, which is equivalent to the visual acuity of 0.5 in the international standard visual acuity scale and mainly reflects the visual function of the macula. Clinical diagnosis is generally based on the standard of corrected visual acuity, and visual acuity greater than 1.0 is called normal visual acuity, and visual acuity 4.7 indicates that visual acuity is lower than normal. The visual acuity test can only reflect the visual function, and the visual acuity of 4.7 cannot infer how many diopters the patient is. Visual acuity and diopters are completely different concepts, and there is no conversion relationship between the two. It is like telling a person’s height, but not directly inferring what their weight is. If you want to determine the number of refractive errors, you need to go to a hospital for an optometric examination. There are many causes of poor vision, mainly due to prolonged, close reading or electronic products causing ciliary muscle spasm, which leads to vision loss and blurred vision. The vision can be adjusted through appropriate rest, distant viewing, and reduced use of electronic devices. Some patients with pseudomyopia do not have a combination of refractive error or other fundus disease, but have a visual acuity of 4.7, most often in adolescents. Patients may also have myopia, hyperopia, astigmatism, and other problems. 4.7 vision can also be caused by corneal inflammation or corneal leukoma, cataracts, fundus disease, and other factors that lead to lower than normal vision.