This can cause ocular vision issues but not always. This is when a person is born without an iris – just giant pupils. This makes the eye with the larger pupil look black. One is much larger than the other – sometimes with barely any iris. This is when a person has different-sized pupils. There are two different genetic mutations that can cause your eyes to look completely or mostly black. We’ve written more on hazel eyes here – check that out! 5. Hazel or amber eyes occur when there is less melanin in the iris and higher lipochrome levels. Research can also be skewed here as in certain countries, people may just categorise these as brown eyes. That said, they still account for less than 10% of the world’s population. Hazel and amber eyes are quite common because they are variations of brown eyes. This makes their eyes look gray rather than blue. Increased collagen in the stroma layer affects how light hits the pigment. What sets them apart from blue irises is the stroma layer. Like blue eyes, gray eyes are caused by a lack of melanin in the iris. Around 3% of the world’s population has gray eyes. Green eyes are rarer than gray eyes, but only by 1%. They need to be careful in bright sun, using eye protection to shield their delicate eyes. Though beautiful, having ocular albinism can be painful and severely impact a person’s day to day life. Because there is such little pigment in the eyes of an albino person, the intricate network of blood vessels within the eye can shine through and make their eyes appear red or purple. True violet or red eyes are phenomena caused by albinism. Though there’s a common myth that Elizabeth Taylor had violet eyes, her eyes were in fact blue. It’s exciting, rare and captivating when you meet someone with different colored eyes! 2. Sometimes both irises have the same base color but one eye will have a striking splash of a rogue color. Sometimes one iris is blue and the other is brown. Heterochromia is a genetic abnormality that causes your eyes to be two different colors. Two different colored eyes (Heterochromia) 5 rare and unique eye colors and how they occur 1. We’ll discuss those genetic outliers beyond our green-eyed friends and you can decide what counts as rare eye color or not. So in the next section, we’ll bring some balance to the eye color conversation. Crazy right? That’s how we end up with the oxymoronic statement: “rarest eye color we commonly see”. The reason these colors aren’t considered is because they are such genetic rarities, they are considered anomalies in humankind. Most reputable sources on the subject of eye colors would agree that green is the rarest eye color, but there are colors even rarer than green. We’ll go into more detail about these pigments later, but suffice to say, that’s genetically super rare! For green eyes to occur, it’s highly likely that at least one of your parents also has green eyes. Green eyes occur when there is more liposome pigment in the iris than melanin. Compared to the 5% of blue eyes in the world, 2% is miniscule! Most of the people in the world who have green eyes are in – you guessed it – Ireland, Scotland and other parts of the British Isles and Northern Europe. The green-eyed among us only account for 2% of the American population and 2% of the world’s population.
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