I honestly don't remember what my prescription is anymore, but I'm fairly certain that I haven't reached -10 or -11 yet.
$1... Has gasket, and the 6 base curve is apparently better for the higher-thickness lenses -- and comes in 55mm wide to boot. (I have a small head... lol Technically I fit better in 53mm, but they just don't seem to make kids glasses with the gasket...)
Anyway -- Thank you!