The naughty boy's eyeglasses’ help.

[glasses shop]

I have a boy, 14, I want to buy a durable black eyeglass. His rx is:
R: -500
L: -375
I saw a cute cartoon glasses frame with perfect glossiness. Except that, the big advantage of such frame is that a spring is connected to the tip of the two temple arms which can be used to warp around the head to protect the glasses from dropping down from the face.

Please help me! Where i can buy this kind of eyeglasses frames?
pls leave your information. Thanks a lot.