Dilating the pupil is a part of making the optometry results accurate. Dilating the pupil uses the anesthetic effect of the dilating medicine to paralyze the ciliary muscle of the eye, temporarily losing the adjustment function and eliminating any possible pseudomyopia. This makes the optometry results more accurate without the influence of accommodation. If the naked eye vision can reach 1.0 after pupil dilatation, then it is “pseudomyopia” and can be cured in the short term, such as medication and vision rehabilitation training, which can relax the tense muscles, relieve fatigue, and restore vision to a normal state. If you don’t want to treat it, your vision may be restored if you let your eyes look far away and take rest. If your naked eye vision is below 0.8 after pupil dilatation, you have “true myopia”. True myopia, once formed, is irreversible. It is an organic change in the eye, where the anterior and posterior axes of the eye become longer, and external objects are imaged in front of the retina through the refractive system of the eye, so there is no clear image on the retina, and of course there is no good vision. This organic change can not make the eye shorten and change the refractive power by any method except surgery, which is the reason why myopia is difficult to cure.