In the clinic, some parents ask, “Doctor, what is a flip-flop, can my child use it? Let’s learn more about the amazing flip-flop today. What is a flip-flop? The English name of the flip-flop is Accomodative Flippers. The flip-flop is also called double-sided mirror, butterfly mirror, adjustable training mirror, because its English name is Accomodatives, so it is also called “Flipper”. It is generally composed of two pairs (four) of lenses. These four lenses plus the handle can be flipped, the appearance is like a butterfly. The two lenses on each “wing” of the butterfly have the same prescription, and the lenses on both “wings” have the same prescription, but with opposite signs. For example, the two lenses on one side of the “wings” are +2.0DS (two hundred degrees of farsightedness), and the two lenses on the other side of the “wings” are -2.0DS (two hundred degrees of nearsightedness). The parameters of positive and negative spherical lenses generally range from +-0.50, +1.00DS, +1.50DS …… to +-6.00DS (of which +1.00DS ~ +-2.50DS is the most common). The use of flip-flop? 1, improve the adjustment sensitivity We often compare the eye to a camera, the adjustment function is like the focus function of the camera, the focus function of a good camera, imaging is not only fast, and the photo is also very clear. When the eye adjustment function is not good enough, then when looking at things feel laborious, not clear. Flip shot through the far-sighted lens to relax the eyes, near-sighted lens tension eyes, so that the eyes a loosening and tightening, just as we are strengthening the muscles in the exercise body. So that the eyes to see far and near the focusing ability to improve and improve, very comfortable use of regulation to achieve the purpose of clear imaging. 2.Promote the balance of adjustment power of both eyes For children with refractive error (different refractive power of both eyes), their adjustment power may be unbalanced, which makes the child unable to use both eyes in a coordinated manner and affects the development of binocular vision function. Therefore, you can train the poorly adjusted eye first, and then train both eyes together after they are balanced. 3, accelerate the speed of amblyopia treatment When amblyopia training after a certain degree of monocular vision, some parents will find that it seems to have reached a bottleneck, that is, how to practice, vision is difficult to improve. At this point, if you check your child’s adjustment, you usually find that there is a problem. Then, if the training of amblyopia is supplemented by some training of the adjustment power as well as the adjustment sensitivity of the flip-flop, it will be found that the child’s vision improvement speed is significantly accelerated. 4, delaying the accelerated progression of myopia The pathogenesis of myopia is still unclear, but research in recent years has shown that myopic children’s poor adjustment power, adjustment lag and other problems leading to hyperopia out of focus is one of the reasons for promoting the rapid progression of myopia, so giving myopic children increased adjustment sensitivity training can help to slow down the progression of myopia.