Wash your hands before dropping eye drops, then remove the eye drops (eye drops should generally be stored in a refrigerator at 4°C) and check whether the drops are expired, precipitated, discolored, or have a bad odor, and if they are found to be spoiled, they should not be used. When using precipitated medication, it should be shaken well before use. Patients should wipe the secretions and tears from the affected eye with a sterile cotton swab before dabbing to improve the efficacy. The patient can sit or lie on his back, tilt his head back slightly, gently separate the upper and lower eyelids with the thumb and index finger of the left hand, look upward, hold the eye drops in the right hand, put 1 to 2 drops into the lower eyelid, then gently lift the upper eyelid so that the drops are fully distributed in the conjunctival sac, and close the eyes for 1 to 2 minutes. Do not force your eyes shut to prevent the medication from being squeezed out. It is difficult for children to cooperate with the medication. Generally, two parents can cooperate, one fixing the child’s head while the other quickly puts the medication into the child’s eye. Try to avoid crying after the medication is administered to the child to prevent tears from diluting the medication and making it less effective. It is best to press the inner canthus with the index finger for a few minutes after dropping the medication to reduce the systemic absorption of the medication through the tear duct. It is important to note that when ordering more than two types of eye drops, make sure to label the drugs with the name, concentration and dosage. When using them, check the drug names strictly to prevent errors from occurring. When using two or more medications in one eye at the same time, use each medication 5 to 10 minutes apart. In addition, care should be taken not to put the drops directly on the cornea (on the black eye) when using eye drops. This is because the increased number of blinks after the medication stimulates the cornea can reduce the efficacy of the medication by causing it to drain.