Is there such a thing as an iris transplant of the eye?

Yes, iris transplants are a real procedure known as keratopigmentation, although they are not as common as corneal transplants. During a keratopigmentation procedure, a thin layer of the cornea, the clear outer layer of the eye, is removed and replaced with a donor cornea that has been stained or tattooed with a desired iris color. Keratopigmentation is sometimes performed for cosmetic purposes to enhance or change eye color, but it can also be used to treat certain medical conditions, such as corneal scarring or injuries.