According to the change of refractive error of myopia after using atropine drops, it can be classified into various types of myopia such as true and pseudophakic. At present, the definitions of true and pseudomyopia are not consistent, and the classification methods are disorganized, so the following unified classification criteria are proposed. Myopia is a state of reduced distance vision and normal near vision, where the use of negative spherical lenses (myopic lenses) can improve distance vision. In this myopic state, there are three possible changes in refractive status after the use of the regulating paralytic (1% atropine eye drops 3 times a day for 3 days or once a day for 7 days), which are named as follows: 1. Pseudomyopia: After the use of atropine, myopia disappears and appears as orthopia or hyperopia. 2.True myopia: After using atropine, myopic refractive error is not reduced, or the degree of reduction is <0.5D. 3.True myopia with pseudophakic component: After using atropine, myopic refractive error is significantly reduced, the degree of reduction is ≥0.5D, but it still does not return to orthophoria, this kind of myopia is mixed myopia. In terms of prevention and treatment, pseudomyopia may return to normal vision after medication (or other therapies); true myopia cannot be treated with medication to reduce myopia; and mixed myopia may reduce refractive error after treatment, but it is impossible to return to proper vision. Some scholars believe that long-term (more than one year) intermittent drops of low-concentration atropine eye drops can effectively slow down the development of true myopia.