My son's prescription is not quite that strong, at +5 in both eyes, but he also has severe astigmatism in both eyes (-4.25 and -4.5). Fun fun! My son wears Miraflex glasses to school, as I love that they are unbreakable. He doesn't fiddle with them, but he is also older. He didn't want to wear them when he first got them (he was 4.5 at the time), but as soon as he relaxed into his prescription and figured out they helped, he never wanted to take them off.
We have the Miraflex for school as well as any sports or outdoor play. They have transition lenses in them, which are new this year and we are really liking. For photos/dressy occasions, he has Adidas wire frames that we also really like.
If you are on Facebook, request to join the Little Four Eyes group. It is a wonderful place with tons of littles in glasses!