A visual acuity of 4.6 is a logarithmic recording method, and a decimal recording method, which is 0.4, indicates a moderate decrease in visual acuity. Visual acuity examination is the most common and basic ophthalmology examination program, visual acuity examination eyes from the visual acuity table is generally 5 m. There are two commonly used visual acuity representation methods, one is the logarithmic recording method, the other is the decimal recording method. The correspondence is generally as follows:4.0(0.1), 4.1(0.12), 4.2(0.15), 4.3(0.2), 4.4(0.25), 4.5(0.3), 4.6(0.4), 4.7(0.5), 4.8(0.6), 4.9(0.8), 5.0(1.0), 5.1(1.2), 5.2(1.5). 5.3 (2.0). A visual acuity of 4.6 indicates vision loss and should be examined further. Causes of vision loss, many of which are detected when vision loss is detected, you should go to the hospital in time for a detailed examination to determine the cause of vision loss, and follow the doctor’s advice to deal with it.