The operation of opening the inner corner of the eye is also called epicanthus correction. Epicanthus is very common in the eastern ethnic groups, showing webbed folds from top to bottom or from bottom to top, often accompanied by a single eyelid. The presence of epicanthus conceals epicanthus, makes the appearance of eye fissure thinner and shorter, and affects the beauty, thus making friends with epicanthus have the idea of opening the inner corner of the eye. It is true that even a successful double eyelid plasty will not be as good as a single eyelid patient with obvious epicanthus. Therefore, surgical correction of severe epicanthus is necessary. There are many surgical correction methods for epicanthus. At present, the most commonly used method in cosmetic outpatient surgery is "Z" skin plastic surgery for epicanthus, which is relatively simple and has few incisions, and is suitable for various degrees of epicanthus. Non-invasive 6-0 or 7-0 nylon thread should be selected as far as possible to reduce the scar of the knife edge. Mustard method (four-flap method), that is, four-flap method, was once popular in correcting epicanthus. However, due to too many incisions and obvious scars, simple correction of epicanthus is rarely used. Only when correcting microcephaly, the four-flap method is still the main operation. Nevertheless, all kinds of epicanthus correction methods will leave obvious recent scars on the epicanthus, so it is necessary to ask the patient carefully whether it is a scar before operation. If it does exist, it is recommended not to operate. Even if it is not a scar constitution, patients should make full preoperative preparations. For mild epicanthus, it is generally not treated. Years of clinical experience have proved that designing a wide tail-shaped double eyelid line with narrow inside and wide outside can effectively cover up the defects of epicanthus. Why do you say that opening the inner corner of your eyes can make your eyes bigger? The appearance of epicanthus usually indicates that there is an extra skin fold in the inner corner of the eye that connects the upper and lower eyelids. The epicanthus will give people a feeling that the eyes are cracked and narrowed, making the whole face look scattered, dim and lacking in aura. Therefore, opening the inner canthus is a way to enlarge the eyes.