A dilated visual acuity of 50 diopters is true myopia. 50 diopters of true myopia does not need to be corrected by glasses for the time being, but it needs to be closely observed and followed up. True myopia is also known as axial myopia or refractive myopia. There are many reasons for true myopia, such as prolonged close-distance use of the eyes, resulting in the gradual lengthening of the eye axis and the gradual enlargement of the eyeball, which causes the light through the refractive system of the eye into the eye after the inability to image above the retina, blurred vision symptoms, which need to be corrected by wearing eyeglasses. There is no cure for true myopia, but it can be corrected clinically by wearing eyeglasses. In addition, for children aged 8 to 15 years old, whose myopia develops more rapidly, you can consider applying some means to slow down the development of myopia, and the most common and effective program is to wear keratoplasty lenses. If there is a symptom of 50 degrees of vision after dilation, you can temporarily do not have glasses, but you need to go for regular checkups, and once the degree reaches 75 degrees or more, you have to wear glasses to correct it.