I don't think I could face getting a tattoo, even though I'm not remotely scared of needles or bothered by injections. Just don't like the idea of the way they're applied.
Surely the point of a tattoo, mostly, is that you yourself like looking at it? That's why people choose a design they like themselves. So eyeball tattoos basically don't have the same purpose as all other types of tattoo.
Although I know I'll never get a tattoo, I do know what I'd get if I did. If that makes sense. Just the outline of a heart, and two smaller hearts overlapping it, on my left wrist. Sometimes I draw it on with a pen, but I'd never actually get it tattooed there because I think "What will that look like when I'm eighty and have wrinkly wrists?"