The possibility of children blinking hard is due to conjunctivitis, inverted eyelashes, dry eye and other causes. Conjunctivitis: It occurs in children, usually associated with poor eye hygiene habits, often touching the eyes with dirty hands, and can be diagnosed by doing a slit lamp microscopy. Inverted eyelashes: caused by congenital developmental abnormalities, the eyelashes on the edge of the child’s eyelid will grow towards the eyeball, thus coming into contact with the cornea, causing a foreign body sensation in the eye and leading to blinking in the child. Dry eye syndrome: It occurs in winter and summer, because when the air conditioner or heater is running, the air becomes drier, and tear evaporation increases, making it easy for dry eye syndrome to occur, which can be diagnosed by going to the ophthalmology department of the hospital to do a tear secretion test and tear film rupture time check. There are many reasons for children to blink hard, so they should consult a doctor in a timely manner and receive standardized treatment under the doctor’s guidance.