There may be many people who believe in the existence of "Yin-Yang Eye". Legend has it that people with yin and yang eyes can see ghosts and some supernatural phenomena that ordinary people can't see. In folklore, some of the eyes of Yin and Yang are born, and some are opened by magic because of curiosity, not only in China, but also in many religions around the world. These people are generally religious gods.
But no matter how serious it is, must the yin-yang eye be true? This is actually just a legend, which belongs to folk superstition and has never been scientifically verified. Moreover, yin and yang eyes are also classified as a supernatural phenomenon, which is believed by many people, but there is no way to prove it. Therefore, yin and yang eyes cannot be classified as real situations. As for why some people believe, the reason is probably the same as the ancients believed that there were immortals in the sky.
Therefore, there is no such thing as yin and yang eyes. Those so-called people can see ghosts, or they are just playing tricks, or people make up stories. The purpose is just to attract people's attention, which is basically fabricated and has low credibility. After all, if there is such a person with yin and yang eyes, he will not be dragged by experts to study it well. After all, everyone is curious to know why he has such power.
Since the Yin-Yang eye itself is superstitious, there will naturally be no real "Yin-Yang eye" in history. What's more, for us, history is just some words and pictures recorded by the ancients. We can only spy on the past that we can't experience through these artifacts handed down. Then we don't know whether these carriers and words are true or not. We can only find the truth through comparison and exploration, which is similar to the supernatural.
There are many ways to get yin and yang eyes in folklore, but these methods basically contain some superstitious elements, such as wiping eyes with willow leaves, dripping eyes with cow tears, transplanting canthus and so on. However, these methods are only legends, especially the transplantation of canthus has brought terrible situations in which relatives kill each other. To do this for a legend that doesn't exist is really a distortion of human nature and moral decay.