Students are naturally farsighted, but the process of myopia is initiated by the large amount of “near viewing” such as TV, computer, and books during the student’s time, which gradually transforms the eyes from farsighted to myopic. The process of myopia is the mechanism of myopia formation. A large number of animal models and clinical studies on the pathogenesis of myopia in the past decade suggest that the myopia process includes a major etiology and two key links. About 85% of myopia is related to “looking close”, such as reading TV, computers, books, etc. About 15% of myopia is related to growth and development of the eye. About 15% of myopia is related to the growth and development of the eye axis. Therefore, nearness is the main cause of myopia in students. The first step to control myopia in students is to control “looking close”, and if we cannot control “looking close”, we need to think of two key links caused by “looking close”. “peripheral field of vision after defocus” and adjustment lag link. A large number of clinical observations suggest that only good control of the two key aspects of myopia onset can achieve good long-term results. 2, students myopia 2 key links: “peripheral visual field after the defocus, form deprivation” and “adjustment lag” link 1, near reflex defocus, deprivation link (i.e. peripheral visual field after the defocus, form deprivation): In the past decade, a large number of domestic and foreign research work further shows When the human eye looks close, both eyes will reflexively adjust and gather inward, which can cause posterior peripheral visual field defocus and form deprivation. The closer you look, the more serious this defocus and form deprivation, the more likely it is to induce the eye axis to become longer, every 1mm long about 300 degrees of myopia. 2, adjustment lag link: that is, long-term “look close”, can cause a decrease in eye focus sensitivity, adjustment lag (also a kind of post-defocus), can also induce the eye axis to become longer, myopia, development. According to the above myopia pathogenesis, modern myopia treatment devices must be able to offset the “look close” or block the two key links in order to obtain good long-term results. Modern myopia treatment instruments are all farsighted and out-of-focus myopia instruments, and are new myopia control instruments based on the “myopia pathogenesis of one cause and two key links”. Compared with traditional myopia devices, the main feature of modern myopia devices is that they can provide defocused or defocused farsightedness, thus offsetting the main cause of myopia, which is “looking close”, and blocking the two key aspects of myopia: “near reflex defocusing” and “adjustment lag”. The “adjustment lag” link. Therefore, the modern farsighted myopia treatment instrument is a kind of myopia control instrument to cure the root cause. A large number of clinical observations show that its long-term effect of controlling the occurrence and development of myopia in students can reach more than 80%.