A child’s left eye always blinking may be caused by visual fatigue, inverted eyelashes, conjunctivitis and so on. 1. Visual fatigue: if affected by environmental factors, mental and psychological factors, excessive eye use and other factors, it will lead to children’s left eye blinking all the time, the clinical manifestations of photophobia, tearing, eye swelling and pain, blurred vision and other symptoms. 2. Inverted eyelashes: due to the eyelashes inverted to the eyeball, irritation of the cornea and conjunctiva and lead to eye discomfort, resulting in the child’s left eye always blinking, accompanied by pharyngeal pain, tearing, photophobia, increased secretion, foreign body sensation and other symptoms. 3. Conjunctivitis: Most of them are caused by microbial infection, external stimulation, allergic reaction and other factors, resulting in the child’s left eye always blinking, manifested as a foreign body sensation, burning sensation in the eye, sometimes accompanied by photophobia, tearing and other symptoms. Parents are advised to take their children to the hospital in time, and under the diagnosis of the doctor, the treatment will be implemented according to the condition.