Tattooed eyes is a new practice of coloring the eyeball by injecting ink into the sclera, (the white of the eye), the layer that protects the eye.
Tattooing the eye is risky and can lead to blindness. Tattoo artists have definitely not been trained to poke eyeballs with needles. The people who perform the injections are not surgeons. Possible unclean needles and ink that is not designed for being injected into peoples eyes could cause permanent damage almost immediately.
There’s no certification for corneal tattooing, just a stranger, in a strange place, with a needle pointed directly at your eye.