The precautions to be taken after rapid pupil dilation mainly include observing the eyes and body for any abnormalities, lifestyle and so on. 1. Observe the eyes and body condition: rapid pupil dilation done patients need to observe the eye congestion, edema, pain, to observe whether there is red, fever and temperature changes, etc., if the patient exists in the eye congestion, edema time is too long, the eye pain is obvious, red, high fever, etc., you need to go to the hospital in time to see a doctor. 2. Lifestyle: After the rapid pupil dilation patients should maintain a regular routine, avoid staying up late, avoid close eye use. The pupil dilation will be more afraid of light after the rapid pupil dilation, so you need to go out and wear sunglasses. At the same time to maintain eye hygiene, not to rub the eyes with the hand. The above are the precautions after the rapid pupil dilation, if the patient after the rapid pupil dilation of eye and physical discomfort, should be timely to the hospital.