Opening the inner canthus is to remove the redundant epicanthus by surgery, expand the visual field and make the eyes beautiful, because epicanthus is often called epicanthus, which makes the appearance of the inner canthus abnormal. In severe cases, it will cover part of the visual field, shorten the fissure and widen the distance between the eyes, which will affect the beauty of the eyes. Opening the inner canthus can improve this kind of problem very well.