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Black eyes are actually very dark brown (with the exception of aniridia). But, the most rare eye color varies depending on a population’s genetic heritage. Overall, the rarest eye color is a toss-up between red and purple (since true black does not involve an iris). Green, amber, and gray are uncommon in certain populations.
Black eyes. Black eyes are rare, accounting for less than 1% of the population. In most cases, black eyes result from genetic mutations. There are two genetic conditions known to cause black eyes: Anisocoria. Differently-sized pupils characterize this condition. Sometimes, the pupil may be too large to notice the iris.
While some people may appear to have irises that are black, they don’t technically exist. People with black-colored eyes instead have very dark brown eyes that are almost indistinguishable from the pupil. In fact, brown eyes are even the most common eye color in newborn babies.
The limbal ring is also a feature of the iris contributing to eye color, appearing as a darkened, occasionally black region encircling the iris resulting from a manifestation of the optical properties of the corneal limbus.
Black is not an eye color. While some eyes may look black, they're either just a very dark brown or large pupils. New classifications have determined that gray is its own standard color.
Eye colors can range from pale blue to dark brown that looks black. The color of your eyes is determined by a combination of pigments in the iris, a two-layer structure that contains clusters of three main pigments: melanin, pheomelanin, and eumelanin.
The six main eye colors are amber, blue, brown, gray, green and hazel, and many different shades and color patterns are possible. What gives my eyes their color? Your eye color refers to the color of each eye’s iris, a double-layered ring of muscle tissue around your pupil that controls how much light enters your eyes.
“When it’s a severe case and the entire front part of the eye fills with blood, we call it an ‘eight-ball hyphema’ because the color of your eye can start to look black,” explains Dr. Bajic.
Black/brown eyes are the most common eye color worldwide. Regionally, those with very dark brown or black eyes make up the majority of people in parts of Africa, East Asia, South Asia, Southeast Asia, Latin America, and the Middle East.
If you are unsure whether your eye color skews more brown or black, here are some tips: Look at your eye color in natural daylight – artificial lighting can distort color. Compare to someone with known brown or black eyes. Look closely to see if your iris has flecks of lighter color – indicates brown.