The last time I checked, prison was the last place you wanted to be, let alone the last place you wanted to get a tattoo. But evidently those crazy convicts are rewriting the book of cool, and now eyeball tattoos are all the rage.
If being in kindergarten taught me anything, it is that putting stuff in your eye is a sure fire way for something bad to happen. But since you're in prison anyway, what else are you going to do than experiment with injecting ink into your eye? Eyeball tattoos = bad decision making.