The hazards of dilated pupils in a 9-year-old child include photophobia, lack of clarity in seeing close objects, and triggering an acute glaucoma attack. 1. photophobia: after dilating the pupil of the eye is in the state of dilation, when the light shines on the eye, it will stimulate the eye, so in the case of strong light, the child will mostly appear photophobia. 2. Seeing objects at close range is not clear: the drugs used to dilate the pupils can paralyze the ciliary muscle, and the corresponding suspensory ligament is in a tense state, which will lead to the flattening of the lens, so that when the child looks at things at a close distance, it cannot be clearly imaged on the retina, and the patient can have the manifestation of seeing objects at close range is not clear. 3. Induce acute glaucoma attack: after dilating the pupil, the iris peripheral accumulation, it may block the angle of the atrium, resulting in atrial aqueous humor outflow channel is blocked, causing acute glaucoma attack, resulting in the child to appear red eyes, vision loss, eye swelling and pain, and even headache, nausea and vomiting and other symptoms. It is recommended that patients follow the doctor’s instructions for care after dilation of pupils, regular checkups, and timely consultation when discomfort occurs.