There is no exact correspondence between visual acuity itself and myopia, so there is no accurate result on the question of how many degrees of myopia is 500 degrees at 4.0. Myopia can be divided into low myopia, which is less than 300 degrees, moderate myopia, which is between 300 and 600 degrees, and high myopia, which is higher than 600 degrees. 500 degrees of myopia belongs to the category of moderate myopia, while four points refers to the category of visual acuity. The results obtained during a general vision test, such as 4.1, 4.2, or even 5.0, 5.1, etc.. This is a result of visual acuity, and it is generally considered normal to have a bare eye vision of 4.8 or more. And there is no accurate correspondence between visual acuity itself and myopia, so there is no very accurate result about 500 degrees of myopia is four point several. Because different people with 500 degrees of myopia have different naked eye vision, maybe 4.4, maybe 4.2, etc. So the phrase about 500 degrees of myopia being four-point-something is meaningless.