Opening the corner of the eye is generally used for eyes with small fissure and epicanthus, and opening the inner corner of the eye is more common. Also known as internal horn plasty, it is to open the internal horn. This kind of redundant upper eyelid tissue can be eliminated by fine cosmetic surgery, leaving no obvious surgical scar (the experience of our hospital is15-this operation can not only effectively widen the eye shape, but also avoid the curvature of double eyelids from being hidden in the inner corner of the eye. Generally speaking, eye length can be increased by correcting epicanthus, such as double eyelid surgery.