Why is my left eye a double eyelid and my right eye a single eyelid?

Double eyelids and single eyelids are connected by genes, and the genes that control the formation of double eyelids usually belong to dominant genes. Now some researchers believe that the difference between single eyelid and double eyelid depends on a person's preference for using the brain. Generally speaking, people with double eyelids prefer to use the right brain, which is more emotional in personality and characteristics. People with single eyelids prefer to use the left brain and are more rational in dealing with people. Some people have double eyelids in one eye and single eyelids in the other. There are two types of them: one is left-handed and right-handed, and their behavior characteristics are mainly left brain; The other is right-handed and left-brained, and the behavioral characteristics are mainly right-brained. But compared with people with the same eyelids on both sides, their brain habits are more balanced and their personality and behavior characteristics are moderate.