To distinguish between true myopia and pseudomyopia, you need to go to a hospital for a dilated eye exam. When you use your eyes at close range for a long period of time, your eyes will be in a state of high tension for a long time, and you will experience myopia, or pseudomyopia, where you see near clearly but see far blurred. Pseudomyopia is mainly due to excessive use of the eyes, resulting in the ciliary muscle in a constant state of contraction and spasm, the lens curvature becomes larger, a long period of “tension” leads to look at the distance also can not relax the regulation, resulting in the focal point of vision in front of the retina, the farsightedness decreases, showing the phenomenon of myopia, not really myopic eyes. The pseudomyopia stage is just a spasm of the ciliary muscle, which causes the lens to be unable to restore the flattened state when looking at the distance, and this stage of vision change is reversible. Without timely intervention, pseudomyopia will turn into true myopia, and once true myopia is formed, it cannot be reversed. True myopia means that even in a relaxed state, parallel light rays are still focused in front of the retina after the refractive system of the eye, resulting in a loss of distance vision, either refractive or axial. So the way to distinguish between true myopia and pseudomyopia is: (1) optometry after using ciliary paralytic drops; (2) clouding method: wear +3.0D spherical lenses on both eyes at the same time, look at distant objects for 3 minutes, then remove the lenses and check the visual acuity immediately, if there is progress in distance vision then it is pseudomyopia, if there is no progress in distance vision then it is true myopia.