1, the principle of action: modern far-sighted myopia instrument to “the doctrine of defocus” as the main principle, supported by a large number of animal and clinical research work. The traditional myopia instrument to “regulation theory” as the main principle, in recent years, most animal tests and clinical observations basically deny students myopia pathogenesis “regulation theory”. 2, the use of the way: modern distance myopia instrument is open eyes to look at the near use, that is, in myopia is most likely to occur, the development of the use of direct farsightedness to look at the near focus. 98% of the traditional myopia instrument is in the closed eye rest or not look at the near use, no direct effect on the focus of looking at the near. 3, offsetting myopia cause: modern farsighted myopia instrument can offset the myopia cause look near, can look near the focus to the far side, so that the more students read and write, the less myopia develops. 4.Block the 2 key links of myopia pathogenesis (1) Modern far-chemistry myopia instrument can provide farsightedness and expand the field of vision, blocking the first key link of myopia near reflex in the regulatory myopia and set of reduced visual field. (2) It can provide focus sensitivity training and block the second key link of myopia, focus retardation. 5.Maintain and create farsightedness Modern farsighted myopia devices can directly provide farsightedness or create a farsighted state to maintain the natural farsightedness and counteract the myopic process. It is known that people are born with hyperopia, and the principle of ophthalmic optics suggests that having a certain degree of hyperopia can ensure that one can see objects near and far clearly, and that students who maintain more than 25 degrees of hyperopia will be myopia-free for life. Therefore, maintaining or creating hyperopia is the most reliable way of vision care or myopia prevention. Modern distance myopia instrument has this function, while the traditional myopia instrument does not have this function. 6, control students myopia long term effect: Because the farsighted myopia treatment instrument can be far from the focal point and offset the main cause of myopia “look near”, and to provide farsighted out of focus and focus sensitivity training, blocking the onset of myopia two key links, control the development of myopia long term effect of up to 80% or more. The traditional myopia device can hardly offset the nearness or block the onset of myopia two key links, its effect will be offset by the daily nearness, the long-term effect is not good.