A lot of people on the internet have been freaking out over a (not real) condition called "Pupula Duplex."
Although the images can definitely make your skin crawl, they are also definitely fake.
The term has never been written about in medical literature, though it has been mentioned in fiction and myth dating back to Ovid's mention of the envious "Evil Eye."
And Liu Ch'ung, the Chinese Minister of State in 995 A.D., has been rumored to have had two irises, but this rumor was not recorded until long after his death.
Then there's this woman who posted about her eye condition on her photo blog: "I have a rare condition... called Photola Shoplex."
Still, no cases of this condition have ever been reported by a professional.
What does actually exist is a condition called "Polycoria," which is the presence of two pupils within one iris, and it looks more like this: