Corneal tattooing may be done with:

Cosmetic tattoos (also known as 'permanent makeup'): They camouflage skin discolorations, such as bihmarks (hemangiomas) or scars, tattooing'hair follicles' into bald areas or corneal tattooing in perforating injury. India ink is the most commonly used dye for corneal tattooing. Two other methods exist: chemical dyeing with gold or platinum chloride and carbon impregnation.