https://www.nature.com/articles/s41433-019-0750-2 (some medical eye images in here that might bug people) This article is interesting.

There are some not exclusively cosmetic reasons to do this, I guess. I was going to say people should wait until there's a larger body of evidence from medical procedures before getting it done cosmetically, but apparently people have been tattooing their eyes forever and the newness is just from the more modern procedures.

I'm still struggling, though. I've got crap eyesight but can't bring myself to get them lasered, so I really can't unemotionally evaluate this. There's an image in that article I linked that will haunt me. I hope it turns out to be safe, if it's going to be a fad.