There are several reasons for goopy eyes. First of all, it may be caused by untidy habits such as usually using dirty hands or towels to wipe eyes, not very often cleaning eyes before or after bedtime. You should supervise your son to regularly do cleaning work of his eyes and tell him to pay attention to personal eye hygiene. Another reason may be unhealthy diets which consist of too much oily foods such as fried chicken, fried fishes which are children's favorite while they do not like eating vegetables or fruits which are rich in water and vitamins that are good for their eyes. You should put foods that contain much vitamin E such as carrots into his daily diet. Thirdly, if the goopy conditions are not changed, then maybe your son's eyes are infected by bacteria, and you should go to the doctor's for an examination. Pay attention to allow his eyes to have adequate rest.