Automatic flip mirror is a commonly used eyestrain relief device for teenagers with excessive eye fatigue, preventing eyestrain symptoms and relieving presbyopia. The predecessor of the auto flip mirror is the handheld flip mirror, which consists of two sets of positive and negative hedging optical lenses. The human eye through the constant flip hedge mirror focusing on the 1000px viewpoint, eye adjustment focus will jump from the front of the eye to 5 meters away from the infinite distance, and then jump back to the front of the eye, repeated training, can significantly improve the sensitivity of eye adjustment and alleviate the state of eye fatigue. Due to the inconvenience of using the mirror by hand, it has not been widely popularized. Automatic flip mirror is a new generation of efficient intelligent eye fatigue prevention and control mirror invented by using modern high technology to improve the shortcomings of handheld flip mirror. Adjustment lag (adjustment insensitivity) is the key link in the occurrence and development of myopia. Automatic flip mirror can make the focus of attention from the front of the eye fogging (virtual) jump to 5 meters away, and then jump back to the front of the eye, so as to significantly improve the sensitivity of eye adjustment, prevent and relieve eye fatigue. Adjustment sensitivity training can improve visual sensitivity and thus improve visual acuity. When the current lens is turned upward, there is a transient visual haze, turned down immediately clear, this haze clear flip process, is to enhance the process of eye regulation muscle exercise, can significantly improve the eye’s ability to regulate. Can also relieve eye fatigue, eye fatigue is the root cause of fatigue regulation, training sensitivity can relieve eye fatigue. It can also relieve the symptoms of presbyopia, the cause of presbyopia is that with age, the crystal gradually hardens and the ciliary muscle strength weakens, resulting in a decline in the ability to regulate, and it is difficult to look at the near. By training the sensitivity, the symptoms of presbyopia can be relieved.