Scleral tattooing is done by tinting the white outer layer of the eyeball by injecting it with diluted ink.
The practice of tinting the white of the eye is a relatively new form of body modification and is gaining popularity throughout the world.
They have garnered more controversy than Japanese Bagel Heads because the look is striking and irreversible, and the long-term effects on vision are unknown, according to this 2013 Huffington Post article.
Body modification artist Russ Foxx from Vancouver, Canada, told Huffington post that there were a number of known short-term risks associated with injecting too much ink during a sclera tattoo, including prolonged headaches, sensitivity to light, and staining of surrounding tissue due to ink migration.
In the news: A model in Canada is warning others after a botched eye tattoo may leave her completely blind in one eye.
Catt Gallinger, 24, of Ottawa, Canada, said she decided to get a sclera tattoo about four weeks ago. The procedure changes the color of the whites around your eye. But weeks after the procedure her eye started oozing purple liquid. Read the full report at CBSNews.com.