According to the change of refractive error in myopia after the use of regulatory paralytic drugs, 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 in this standard refers to the state of myopia in which the distance vision is reduced and the near vision is normal under the condition of normal adjustment, and the inspection shadow is myopic refractive error, and the use of negative spherical lenses (or the addition of column lenses) can improve the distance vision. This myopic state has the following 3 possible changes in refractive state after using the regulating paralytic drug (1% atropine eye drops 3 times a day for 3 days; or once a day for 7 days), named as follows: 1. Pseudomyopia: It means that after using atropine, myopia disappears and presents as orthopia or hyperopia. 2.True myopia: Refractive error of myopia is not reduced after using atropine, or the degree of reduction is <0.5D. 3.True myopia with pseudophakic component: Refractive error of myopia is significantly reduced after using atropine, and the degree of reduction is ≥0.5D, but it still does not return to orthopia, and 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 at present; and mixed myopia has the potential to reduce refractive error after treatment, but is unlikely to return to proper vision.