what would cause unequal pupil size in my child's eyes?
unequal pupils is called "anisocoria" and is most commonly caused by hjorner syndrome or a third nerve palsy. in both conditions an abnormality or asymmetry of the lid will likely be noted. with horner's the problem is on the side with the smaller pupil; with 3rd nerve palsy the larger pupil is the problem side. other causes coud be trauma vision problems or even familial.