1. Do not take aspirin two weeks before canthotomy, because aspirin will reduce platelet coagulation function;

2. Patients with hypertension and diabetes should inform the doctor of their own condition in detail at the time of initial diagnosis, so that the attending doctor can confirm the operation plan for opening the corner of the eye;

3. Make sure that you are in good health before the operation, and there is no infectious disease or other body inflammation;

4. Don't put on makeup before eye surgery;

5. Men should give up smoking and drinking one week in advance before opening canthus surgery;

6. Women should avoid menstrual period.