If your child is blinking a lot when watching TV, it might be a habitual tic. Blinking is a common and harmless tic for many children. Repetitive behaviors like this often go away after some time. Otherwise, blinking a lot when watching TV could be a sign that they need glasses to correct nearsightedness, farsightedness, or astigmatism. If you are concerned about the blinking, let your child's healthcare provider know so they can examine the behavior first-hand.