Do you ever wonder why people’s eyes are so different? Why are there so many colours? Eye colours have been a mystery to many scientists over the years. Some say it is because of genetics, others say it is merely random. If these questions has ever popped into your mind at one point or another, here you can read everything you want to know about it.
What is Melanin and Pigment?
Melanin is a Pigment found in the front of your eye. Pigment is a natural colouring. Eye colours come from different amounts of pigment. For example, lack of pigment would result in blue eyes, because they are very light. Some pigment results in green eyes, as they are slightly darker, and lots of pigment results in brown eyes. If your eyes are blue-green or hazel, don’t worry, because there is an explanation for that too. Blue-green eyes have the amount of pigment between green and blue eyes, because they are darker than blue but lighter than green. Hazel eyes have the amount of pigment between green and brown eyes, because they are lighter than brown but darker than green. Although the most common eye colours are brown and blue, other rarer colours are grey, green, red, and amber. “Red eyes do exist,” Says Eye Doctors of Washington, “Red eyes are often called pink. Picture white bunnies with pink eyes. What you’re actually seeing in these rabbits and in albinos is the blood vessels behind the iris. Because there is so little melanin in the eyes, there is nothing to conceal the blood vessels hard at work.” Wouldn’t red eyes be a little creepy? Although weird, this explanation makes sense. If your eyes have no pigment or melanin, wouldn’t they just be clear? And if they’re clear, wouldn’t it make sense that the only thing visible are the blood vessels?
What are the possibilities of heterochromia?
The possibility of having heterochromia is quite slim. In fact, only 1 percent of the human population has it. Heterochromia also occurs in animals. Have you ever seen a photo of a little puppy with one brown and one blue eye? Aren’t they the cutest? Well, just like humans, animals can be affected too. Heterochromia appears most in cats and is actually pretty common. In fact, about 60-70 percent of the cat population has heterochromia. In dogs, however, this disease is quite uncommon. Only about 3.5 percent of all dogs have it. In this 3.5 percent, most of the dogs that have a merle coat have heterochromia. “Also, eye colours don't come out as a blend of the parents' colours, as in mixing paint. Each parent has two pairs of genes on each chromosome. So multiple possibilities exist, depending on how the ‘Wheel of Fortune’ spins,” Says all about vision. Pigment is also found in other parts of the body, so this shows that the colour of the eyes can also depend on skin and hair colour.