Refractive correction is the process of adjusting and moving a clear image that cannot be accurately presented on the fundus of the eye to a specific position on the fundus of the eye so that the person with refractive error can obtain clear vision. This “correction” is a correction of the focus state of the refractive system of the eye, not a change in the original structural characteristics of the refractive system itself (such as eye size, corneal and lens optical parameters, etc.). Just as a person with a short height can change his or her external height status by wearing high heels, it does not change the structural characteristics of the body. There are two major types of refractive correction methods: glasses (including frames and contact lenses) and refractive surgery. Refractive surgery is divided into corneal surgery and lens surgery. The essence of the former is to sculpt a pair of fixed prescription corrective lenses on the eligible cornea by high-tech means, which cannot be removed. The essence of the latter is the surgical removal of an unsuitable focusing lens (lens) / replacement of a suitable focusing lens (replacement IOL) / addition of a supplementary focusing lens (supplementary IOL). The above mentioned surgeries can also only improve the focusing status of the eye of a refractive error patient, but cannot change the essential characteristics of the eye, just as rhinoplasty can improve the appearance of the nose, but cannot change the inner characteristics of a person with a short nose. Due to the current state of awareness and basic and clinical research, the treatment of refractive error is still limited to correction, but there is no real effective treatment, let alone a fundamental cure for myopia and hyperopia. Some “treatments” (including instruments, medications, etc.) are not only unlikely to be effective, but may even be counterproductive! However, for developing children, appropriate correction can promote the normal development of visual functions (including visual acuity, stereopsis, etc.) and effectively avoid the occurrence of amblyopia, stereopsis, and other abnormalities. At the same time, through the appropriate means of correction, scientific eye care can provide a relaxed, comfortable and benign environment for the structural development of the eye, avoiding and blocking the role of adverse external factors on the deepening of refractive error.