J.K.
I work for an ophthalmologist and when people describe those symptoms, we bring them in right away. It could just be floaters like the other people have written, but it could also be signs of a retinal detachment. It doesn't happen that often in children, but better to be safe than sorry. I would reccommend a pediatric ophthalmologist not optomistrist because they have to go through medical training and have a greater understanding of eye problems. Good luck!