Dry eye is a disorder of the tear film due to tear deficiency or excessive tear evaporation which causes damage to the interpalpebral ocular surface(i.e.exposed eye surface) and is associated with symptoms of ocular discomfort.Dry eye is more common in those elder than 40 because of decreasing tear production with aging.Dry eye in young population has been over-looked.In fact,children with dry eye are increasing and usually don’t respond well to conventional antibiotics therapies.Vitamin A deficiency related keratoconjunctival sicca is used to be the leading cause of blindness in children,but it becomes rare nowadays.However,sub-clinical vitamin A deficiency,video display terminal syndrome,abnormal blinking,contact with pets and toys,systemic inmmune diseases and allergies are also common causes of dry eye in children.