One-and-a-half-year-old boy Liangliang, looking tiger head, people love. But Liangliang’s mother has always had a problem, because from childhood, wherever she went, people who saw Liangliang said, “This boy is so good-looking, but it’s a pity that he has a ‘cross-eye’.” The doctor examined Liangliang carefully and told his mother that the child was not “cross-eyed”. “But why do people who see Liangliang say he is ‘cross-eyed’?” The mother questioned. The doctor explained that Liangliang has a pseudo-internal strabismus caused by canthus. The inner canthus is a vertical half-moon skin crease covering the inner canthus, usually symmetrical in both eyes, mostly seen in childhood, especially in those with flat nasal bridges, because the redundant skin covers the inner canthus and part of the nasal side of the bulbous conjunctiva (i.e., the inner “white” part of the eye), it appears that both corneas (black eyes) have the feeling of leaning inward, thus giving the appearance of This gives the appearance of “crossed eyes”. In the case of Ryo, he inherited his mother’s flat nose, which gives the illusion of “cross-eyed” eyes. Mild canthus does not need to be treated. As children grow older, their nasal bones develop and bulge and their eyes develop, the canthus will mostly disappear naturally; if it is still obvious in adulthood, cosmetic surgery is feasible. After hearing the doctor’s words, the mother’s heart finally dropped.