There is no exact correspondence between the degree of myopia and the visual acuity. The approximate range of myopia 550 degrees naked eye vision is between 0.15 and 0.3, which is moderate myopia. The same 550 degrees of myopia, in different periods of time, the detection of vision values are different. Especially when the eyes are more tired, the naked eye vision tested will be worse. Myopia and visual acuity are not directly equivalent. Myopia usually refers to the refractive error of the patient’s eye. Naked eye vision is the number of degrees of visual acuity that a person’s naked eye can see without glasses or any correction. So the naked eye visual acuity of 550 degrees of myopia can only be in the range of the interval, and there is no specific data. It is recommended that patients with 550-degree myopia should usually protect their eyes, which can delay the further aggravation of myopia. It is also necessary to pay attention to the correct use of the eyes, to avoid the aggravation of myopia caused by overwork and incorrect use of the eyes.