Dilating the pupil for iritis requires 1 to 2 weeks, and the exact time issue needs to be judged in relation to the severity of the condition. Iritis, also known as iridocyclitis, is treated primarily through the use of pupil dilators. In more severe cases, slow dilators, such as atropine, are used for a period of 1 to 2 weeks. The condition is more mild, you can use rapid pupil dilator, such as compound tropicamide eye drops, after a week of medication, the condition is reduced, you can reduce the amount of medication as appropriate. Iritis pupil dilation, medication and dosage, need to be judged according to the severity of the disease. After a period of time, the condition improves, you can reduce the dosage, it is recommended to listen to the doctor’s advice on the use of medication, to avoid the wrong medication.