Erythromycin eye ointment can be used for mydriasis. Erythromycin eye ointment is a type of antibiotic eye ointment that is mainly used for the treatment of local inflammatory conditions, such as mydriasis, conjunctivitis, and keratitis. The eye ointment can be applied once before going to bed to maintain the effective drug concentration in the eye for 24 hours, which is beneficial to the recovery of the disease. Local hot compresses can also be given to promote blood circulation around the eyelids, which also facilitates the recovery of the disease. When a local abscess is formed, the effect of conservative medication is estimated to be very poor. At this stage, it is usually recommended that an early surgical incision be made to drain the pus to avoid the spread of infection, which is dangerous after the formation of orbital cellulitis, especially when it may cause intracranial infection.