What is stereopsis and stereopsis? In 1839, the British scientist Winterston discovered a wonderful phenomenon: the distance between the two eyes is about 6 centimeters, and when looking at any object, the angle of the two eyes is not exactly the same, that is, there are two different so-called perspectives. This subtle difference in angle through the eye retina to the brain, you can distinguish the front and back of the scene, and then produce a strong sense of stereo, that is, stereopsis. Although one eye can see an object, it is not easy to accurately determine the distance to the object. People who lack stereo vision are called stereo blind. Stereopsis is a visual function that is indispensable to human beings, from threading a needle in daily life to jumping over a cliff and other dangerous movements. Through binocular vision, we can not only distinguish the height, width, surface color and lightness of things, but also determine the distance of objects from us and the distance between them. This advanced visual function is necessary for modern science and technology. Many occupations and types of work, such as various drivers, athletes, doctors, electronics, modern precision machinery manufacturing, modern communications, aviation, aerospace, navigation, various scientific experimental research, etc. must have sharp stereo vision to be able to perform. According to the data survey: the driver factor caused by the car accident, 20% is due to the lack of stereo vision caused by the driver! In college admissions and towards the workplace, vision and stereo vision is an important indicator, if the stereo vision is not qualified, even if the physical fitness and intelligence, but also can not be selected. Every year, some candidates are forced to change their volunteer because they do not have perfect stereo vision in the college entrance examination. Stereo vision is so important to people, and it has a short growth span. What are the causes of stereo blindness? Children with strabismus and amblyopia that are not treated in time will have a hard time re-developing their stereo vision. In addition to strabismic amblyopia there are some unknown causes that may also lead to stereo blindness. Stereo vision should be established scientifically, early and as soon as possible. Many parents believe that strabismus will get better when the child grows up or that it will only affect the appearance and will be treated when the child grows up. In fact, this is wrong. If treated after growing up, although the appearance may improve, stereopsis may be lost forever. Early treatment of strabismus will not only improve the appearance and the range of hazards associated with it, but will also establish stereopsis. In addition to strabismic amblyopia, children with normal vision in both eyes may also be stereo-blind due to other factors. Therefore, timely examination, early detection, and necessary training can help establish or restore normal stereopsis. With the increasing standard of living and the rapid development of science and technology, people’s awareness of stereo vision will also deepen. The importance of stereo vision is directly related to the quality of life of individuals, and its importance will certainly be more widely understood and concerned.