Maintaining a farsightedness of 25 degrees or more will ensure a lifetime of myopia. The best way to prevent myopia is to preserve farsightedness. Farsightedness is a method of maintaining and creating a state of farsightedness by shifting the refractive focus of the human eye to a distance of 5 meters using optical and physical methods, and by training the sensitivity of far and near focusing. The method of maintaining and creating a hyperopic state by shifting the refractive focus of the human eye to a distance of 5 meters and performing distance-near focus sensitivity training can prevent visual fatigue and improve eye efficiency, and stop and counteract the process of myopia. Modern eye care regards hyperopia as an energy fast line for eye care.
In order to maintain good vision and prevent the occurrence and development of visual fatigue and myopia, each student’s eyes need more than 10 minutes of hyperopia treatment every day to replenish energy and prevent farsightedness from becoming myopia. The most direct way to prevent hyperopia is to use out-of-focus lenses.
I. Types of modern hyperopic defocusing lenses
Modern farsighted defocusing lenses can be divided into three main categories according to their way of farsightedness “looking closer” focus.
1.Defocusing defocusing lenses (belonging to the 2nd generation of basic myopia devices): they can virtualize the refractive focus when looking at the near to the far side of 5 meters away, directly offsetting “looking at the near” as the main cause of students’ myopia, and providing hyperopic defocusing (front defocusing), blocking the first key link of myopia: “peripheral The first key link of myopia can be blocked: “peripheral vision after defocusing”, such as patch type telephoto mirror, frame type telephoto mirror and table lamp type telephoto mirror, etc.
2.Focusing distant lenses (belong to the 3rd generation of enhanced myopia instrument): can guide the eye refractive system for far-seeing and near-seeing focusing movement, so that the high focusing sensitivity when looking at near, blocking the second key link of myopia “adjustment lag out of focus” caused by the occurrence and development of myopia. Such as eye sensitivity telecine or resonance sensitivity telecine.
3.Focus-shifting telephoto lenses (belonging to the 4th generation of enhanced myopia devices): they can shift the refractive focus of near vision to a distance of 5 meters away, directly offsetting “near vision” and providing progressively enhanced hyperopic defocus, blocking the first key link of myopia, “peripheral visual field after defocusing”. “It is a reinforcing type of defocusing lens because its effect can be reinforced in a relay manner. Such as automatic telephoto lenses.
The defocusing, focusing and shifting teleoptosis methods are the three most widely used and effective teleoptotic defocusing lenses in clinical practice.
Second, the principle of the action of modern hyperopic defocusing lenses
The concept of “one main cause and two key links” is the principle of the modern hyperopic defocusing lens.
A large number of studies have shown that the occurrence and development of myopia in students is related to “one main cause and two key links”. That is, the main cause of myopia in students is “looking at the near”, looking at the near mainly through the near reflex “peripheral visual field front defocus” and “adjustment lag” two key links to cause and aggravate myopia. Any myopia prevention method must control the “nearness” or the two key links in order to obtain good long-term results.
Farsighted defocusing lenses can offset the main cause of myopia by optically shifting the near focus to the far side, and can also block the two key aspects of myopia: “near reflex defocusing” and “adjustment lag” by providing farsighted defocusing or training eye adjustment sensitivity. “and the “adjustment lag” link. Since its effect is a curative one, the long-term effect is better.
Animal experiments: Studies on a large number of animal models of myopia, such as rhesus monkeys, by the Zhongshan Eye Center (State Key Laboratory), the University of New South Wales Vision Institute in Australia, and the University of Houston College of Optometry in the United States, have confirmed that the placement of myopic (negative) defocusing lenses in front of the eyes can cause and aggravate myopia, while the placement of hyperopic (positive) defocusing lenses can prevent the development of myopia. It is suggested that hyperopic defocusing lenses can prevent the occurrence and development of myopia.
III. Long-term effects of modern hyperopic defocusing lenses
Henan Medical University, Zhongshan Eye Center, Guangzhou Doctor’s Institute, the former head of the Chinese students myopia expert group, Professor Xu Guangdi and other clinical observation of a large number of students, found that hyperopic defocusing lenses (i.e., hyperopic lenses) can effectively control the occurrence and development of myopia in 30% to 87% of students. The average efficiency is more than 80%.
Future Prospects
Farsightedness defocusing mirror (i.e., farsightedness mirror) is the mainstream myopia treatment instrument that will definitely become the control of the occurrence and development of myopia in students in the future, because
(1) The most authoritative myopia research units at home and abroad, such as the Zhongshan Eye Center and the American Research Center, are studying myopia in the mainstream direction of defocused myopia and form deprivation myopia, and the farsighted defocused mirror is a myopia control product developed with their research results as the principle of research and development.
(2) The concept of “one cause and two key links” in the development of myopia in students has been confirmed by a large number of animal tests and clinical studies, and will definitely become the guiding principle of myopia control for students in the future. The farsighted defocusing mirror is a series of myopia control devices designed to address the “one cause and two key aspects” of myopia development in students.
(3) Clinical observation confirms that the farsighted defocusing mirror can effectively control the development of myopia by more than 80%. Moreover, it is easy to use, it is used in reading and studying or in the entertainment of watching TV and computer, so students can easily persist for a long time and get good long-term effects.