Pay attention to hygiene when ordering medication, wash your hands, lie on your back or head up, look in the direction of the head, gently pull the lower eyelid or separate the upper and lower eyelids with one hand, take the eye drops with the other hand, the mouth of the bottle should be more than 5 mm away from the eye, drop the eye drops to the surface of the eye and close the eye lightly for 5 to 10 minutes to let the medication in the eye to play its full role, then screw the cap to prevent the eye drops from being contaminated. Older patients or those with poor vision in the other eye are advised to have their family members help with the eye drops to prevent infection. Do not put the mouth of the eye drops into the lower eyelid or directly touch the eyeball, because the surface of the normal human eye has bacterial growth, the mouth of the bottle is contaminated with bacteria can multiply in the eye drops, drops into such eye drops not only can not sterilize, but will lead to the aggravation of infection.