Well, in some degree, it is normal to see many babies to roll their eyes back. But you also need to know that that can be a sign of eye infection. So you should pay more attention to it. For your situation, you should not let your baby roll their eyes any more. And then check their eyes to see if the eyes are red or not. Also, you can just give him some eye drops to relieve the discomfort. What is more, just take your baby to see the eye doctor as soon as possible.
Absolutely not normal. How old is you baby? Can he/she speak? If he/she can speak, you need to check his/her eyes carefully if there are dust, hair or other things, as well as inflammation. Wash eyes with clear water, ask his/her feeling. If s/he still feel uncomfortable, call your doctor. For an infant, if there is any abnormal action, do not hesitate, go to hospital ASAP.
It is not normal for your baby to roll his eyes back. Maybe his eyes get the infection which causes the baby to roll his eyes in the unconscious way. You should take your baby to the hospital and have the full check on the eyes. Then your baby could accept the medical treatment as soon as possible. Then he will not have the habit of rolling his eyes.