After dilating the pupil, the patient’s precautions mainly include avoiding bright light stimulation, avoiding close vision, pay attention to allergic reactions, and so on. 1. Avoid bright light stimulation: Dilating drugs can make the patient’s ciliary muscle paralysis, pupil dilation, encountering bright light stimulation pupil narrowing and weakening of the adjustment ability, the light will be directly into the fundus, which is easy to cause irritation, or even damage to the fundus, and the patient may appear photophobic. Therefore, patients need to avoid bright light stimulation, reduce outdoor activities, and wear sunglasses and sun hats. 2. Avoid close vision: after dilating the pupils, patients may have blurred vision, this time reading books, looking at cell phones will not see clearly, so it is best to rest, avoid prolonged close eye, easy to visual fatigue. 3. Pay attention to allergic reactions: some patients may have a rash after using dilated drugs, and in severe cases, there will be shortness of breath, facial flushing and other allergic reactions, patients need to seek medical treatment in time. It is recommended that patients follow the doctor’s instructions for care after dilation, regular checkups, and timely consultation when discomfort occurs.