Dilated pupils are mainly used in eye examinations and treatments to relax the eye muscles and dilate the pupil through medication to meet the needs of the examination or treatment. However, it is important to note that patients may experience photophobia for a period of time after pupil dilatation, which is normal. Dilated pupils are mainly used in adolescent optometry to improve the accuracy and effectiveness of the refractive treatment. It is also used clinically to assist in the treatment of uveitis, amblyopia, keratitis and other eye diseases. It should be noted, however, that dilating the pupil is not recommended for patients with closed-angle glaucoma, as it may trigger an acute attack of glaucoma and lead to uncontrolled intraocular pressure. Dilated pupils may lead to the following conditions: 1. Eye irritation: Dilated pupils may cause transient local irritation, which may result in eye discomfort such as a tingling sensation, and may also cause adverse reactions such as photophobia, increased intraocular pressure, and conjunctivitis. 2. Visual impairment: After dilating the pupils, there may be blurred vision and inconvenience due to the effect of the medication, causing some discomfort, but the symptoms will gradually ease However, there are usually no after-effects.