Refrain from taking vitamin C, E supplements, cod liver oil, and herbs 1-2 weeks before surgery. 2. If you have any underlying diseases, inform and consult a doctor before starting surgery. 3. It is not necessary to abstain from food before surgery, but it is better to get enough. 4. If you are wearing contact lenses, remove them before the surgery. 5. Prepare sunglasses to protect against dust particles after surgery.