The effect of canthotomy is very good, and canthotomy is generally divided into inner canthus opening and outer canthus opening. Opening the inner corner of the eye can remove the skin wrinkles in the inner corner of the eye, show the lake of tears, increase the crack of the eye and make the eye bigger and brighter; The outer corner of the eye is an operation to cut the lateral mucosa of the eye, which is more suitable for people with short eyes. The horizontal length of the eye can be delayed by 2-3mm, leaving no scar, which can have a satisfactory eye enlargement effect.