Myopia can be categorized into true myopia and pseudomyopia, according to the degree of differentiation is considered less than 100 degrees of myopia is pseudomyopia, so 50 degrees of myopia belongs to the category of pseudomyopia. Pseudomyopia is caused by long-term over-exertion of eyes, which leads to over-adjustment and spasm of ciliary muscle, thus causing the lens to become convex and changing the refractive state of the whole eye, resulting in myopia. From the etiological point of view, pseudomyopia can be relaxed through sufficient rest and corresponding physical therapy measures, so that the ciliary muscle over-regulation and spasm can be relaxed, thus restoring the shape of the lens to normal, changing the refractive power of the whole eye, and lowering the myopia or even restoring it to normal. Therefore, myopia of 50 degrees can be completely normalized through rest and corresponding physical therapy measures.