Some girls do get cosmetic eye surgery, probably to the same extent that American girls get nose jobs. South Korean girls get way more plastic surgery, for a number of reasons:
- covered by national health care
- stronger "idol" culture
- more homogeneous "look" to start with
To wildly generalize and stereotype, Japanese put themselves in one of three "looks": Asian (Mongol), Polynesian, or Native. It all comes down to cheekbones and nose size. To me, all the girls pictured are typical Japanese girls. NOTE: you may be getting fooled by the eye makeup, which is specifically crafted to give the girls 'manga eyes'.