The rare eye feature that lets some people see colors others can't

Superhuman vision that's stranger than fiction is more likely to occur in women. In fact, Bishop Professor of Ophthalmology Dr. Jay Neitz says that "tetrachromats" can see 100 million colors rather than the just 1 million of the average person.

They have a genetic mutation called "tetrachromacy". It's passed through the X chromosome, about 12% of women have it and yes - there is a genetic test to see if you do, too!

According to BBC Science Focus, a person is born with a fourth cone, known as a tetrachromat, and can see new color ranges within the yellow and green spectrum, opening up millions of new color variations. 

Learn more about the colorful world of tetrachromacy in this article in Health Digest.