Taboo:
1, severe scar constitution is the contraindication of canthotomy, or patients with abnormal coagulation mechanism should explain to the doctor in advance.
2, during pregnancy or menstruation, due to medication and blood coagulation disorders, so as not to affect the fetus or open canthus surgery bleeding. It is also one of the contraindications of canthotomy.
3, allergic to local anesthetics, or anti-anesthetic.
4./kloc-Children under 0/3 years old are contraindications for canthotomy, so canthotomy cannot be performed.