Many myopic patients do not have enough understanding of nearsightedness. My understanding of nearsightedness is limited to, and I cannot see things clearly. It may be myopia. I do not understand the specific causes of myopia and myopia. The following let Xiaobian answer everyone, the principle of myopia and corrective principles of glasses. To make a better understanding, our eyes are like a human body camera. The nose of the camera is a convex lens. The light will refract through the convex lens. We adjust the focal length of the lens to focus the light on the camera film. A clear image is inverted, then it is turned into a photo by a phase washing device. The eyeball is basically the same as the camera's working principle. Its transparent part cornea, lens, vitreous body is like a camera lens, can also refract the light entering the eye, focus, if you want to adjust the position of the eye lens before and after, we will shrink or relax the ciliary muscle, the thickness of the lens and The curvature changes as a result. Proper adjustment of the ciliary muscle enables proper focusing of the incoming light on the macular retina, making it a clear image. If we are nearsighted, this camera will undergo optical changes and will not focus properly. As mentioned earlier, myopia is due to eye muscle tension, long-term over-regulation of the lens, and long contraction can not go back. Coupled with over-regulation caused by the collective behavior, resulting in high intraocular pressure, further elongated axial. Originally, when the lens is normal, the distant light first enters the eyeball in parallel, and then the light is converged on the retina through the lens. Once the eye axis becomes longer, the focus of the lens will move forward. The distant light passes through the lens and is focused in front of the retina. Of course, it will not be clear to see. Because it is not clear to see things, there are smart people inventing tools. The nearsighted mirrors we use now are invented by Bacon in the middle of the 13th century. One day, when it rained, Bacon looked at the leaves through the raindrops and found that the veins of the leaves looked very clear. Even the fluff was seen very clearly. He went home and took out the glass and made it inlaid on the wood. This invented the glasses. Therefore, we wear a normal myopia lens is actually a concave lens, he can be the first outside the incoming parallel light divergence, and then into the glasses, to correct the excessive focus of the lens, so that the light can be focused through the dual role of the myopia lens On the retina, children can see distant objects. The above text is provided by Yishili online optician experts. Please indicate the source. This information is from China Glasses Exchange Network:, Contact
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