According to the anatomical structure, myopia can be divided into two categories: axial myopia and refractive myopia. Most myopia is axial myopia, that is, myopia caused by excessive growth of the eye axis. Most children are farsighted when they are born. As the child grows older, the eye axis of the child will also grow like the height. At this time, the child will gradually transition from hyperopia to emmetropia, but if it grows too fast, it is easy to become myopia.

Generally speaking, the longer the eye axis of a child, the higher the probability of myopia. For children in the growth and development period, it is best to control the annual growth of the eye axis within 0.3 mm. By the age of 18 or so, the child's height development is basically complete, and the eye axis will gradually stabilize. It can be seen that the root cause of convex eyes is the long eye axis caused by high myopia, which has nothing to do with wearing glasses.

The reason why glasses can change our vision from blurred to clear is because the lens changes the vergence of light. Myopia glasses are concave lenses, which diverge the light entering the eye and then image it on the retina, allowing the wearer to see the outside world clearly. However, the concave lens itself will cause the visual object to become smaller due to its optical effect, and it will become smaller and smaller as the degree of myopia increases. From the perspective of others, the eyes of people wearing myopia glasses will also become smaller, and at the same time give people a feeling of deformation of the eyes.

In fact, a pair of qualified glasses can not only correct vision, so that we can see clearly, comfortably and for a long time, but also can modify some defects of the wearer's eyes and face. On the contrary, if you do not wear glasses for myopia, blurred vision may lead to visual fatigue, which will lead to changes in visual functions such as accommodation and vergence over time, which will not only easily deepen myopia, but may even lead to strabismus, which is harmful but not beneficial.