Full femtosecond myopia surgery, i.e. full femtosecond laser surgery, precautions include preoperative and postoperative precautions. 1. Preoperative precautions: Before surgery, you should follow the doctor’s instructions to exclude contraindications to surgery, such as acute conjunctivitis, keratitis, glaucoma, severe dry eye, one-eye, keloid, etc. You should also stop wearing contact lenses and use antibiotic eye drops if you have any problems before surgery. Before surgery, you should stop wearing contact lenses and use antibiotic eye drops as prescribed by your doctor. If you have a cold or fever before surgery, you should inform your doctor in time so that you can make reasonable arrangements for the surgery. 2. Postoperative precautions: After the operation, patients should follow the doctor’s instructions to take medication, pay attention to protect the eyes, avoid foreign objects entering the eyes, or eye trauma, and avoid splashing water into the eyes when washing the face and hair, and avoid applying make-up on the eyes within 1 week after the operation. In addition, patients should follow the doctor’s instructions for regular checkups, and should pay attention to rest after the operation to avoid eye fatigue, so as not to affect the effect of the operation. Specific precautions should be consulted with a specialized doctor, and patients should follow the doctor’s instructions for preoperative and postoperative care.