First, the history of the invention of the automatic flip mirror The automatic flip mirror, formerly known as the handheld flip mirror, was invented by Professor Bates, a famous American myopia expert. It consists of two sets of positive and negative hedging optics. The human eye through the constantly flipping hedge mirror to look at 1000px target, eye adjustment focus will jump from the eye to 5 meters away from infinity, and then jump back to the eye, repeated training, can significantly improve eye adjustment sensitivity and prevent myopia, development, and improve visual acuity. Bates flip mirror by Europe and the United States and a large number of research applications, confirmed that it is very effective in the prevention of myopia, eye fatigue, presbyopia and vision enhancement. However, due to the inconvenience of constantly flipping by hand, it has not been widely promoted so far. Auto-flip mirror is a new generation of efficient intelligent myopia prevention and control mirror invented by Professor Liu Dongguang, a graduate student of Sun Yat-sen University Eye Center and a famous myopia expert and winner of more than 50 national profits, using modern high technology to address the shortcomings of Bates mirror in promotion. Second, the automatic flip mirror principle of action 1, the principle of myopia prevention and control: “adjustment lag” (i.e. adjustment is not sensitive) is the key link in the occurrence and development of myopia students. This mirror can constantly flip the front lens so that the focus of attention from the front fog (virtual) type jump to 5 meters away from the far side, and then jump back to the front of the eye, thus significantly improving the eye adjustment sensitivity, to prevent the occurrence of myopia, development. 2, improve visual acuity principle: (1) adjustment sensitivity training can improve visual sensitivity and thus improve visual acuity; (2) the current lens flip up when a transient visual haze, flip down immediately become clear, this hazy clear flip process, is the process of vision growth, the famous American myopia expert Professor Bates also found that the flip mirror can significantly improve the visual acuity of amblyopic eyes and most myopic eyes. 3, to prevent eye fatigue symptoms: eye fatigue is the root of the disease is regulation fatigue, so training the adjustment sensitivity can be prevented. 4.Prevent presbyopia: The reason for presbyopia is the aging of the crystal and the decrease of adjustment power. Therefore, training the adjustment sensitivity can be prevented. 3.The scope of application of auto-flip mirror is to prevent and control various kinds of youth myopia, to improve naked eye vision and amblyopia, to prevent various eye fatigue symptoms and to improve presbyopia.