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People with brown eyes may be less vulnerable to certain diseases. If you have brown eyes, you'll be happy to know that researchers have found the higher melanin content in your eyes is associated with a number of health benefits. But within 12 to 18 months, more melanin can accumulate in the iris, causing eye colour to change from blue to green, hazel or brown. Due to complex variations and interactions of genes, it's hard to say with certainty what colour eyes a child might end up with.Īlso, the eyes of many Caucasian babies contain very little melanin at birth and will appear blue in the first few months of life. So it's very possible for children in the same family to have different eye colours, and eyes that are not the same colour as those of their parents. In fact, there is evidence that up to 16 genes can influence eye colour. But predicting eye colour from your family tree is more difficult than you might expect. And those with a high concentration of melanin are medium or dark brown.Įye colour is an inherited trait. Eyes with a bit more melanin are green, hazel or light brown. The amount of this pigment (called melanin) present in the iris of your eye determines the colour of your eyes.Įyes with very little melanin in the iris are blue. What causes brown eyes?Įven though there are different eye colours, including less common blue eyes and green eyes, there is only one type of eye colour pigment. There is plenty of variation in the appearance from person to person, and there are even health advantages to having brown eyes (more about that later). If you include hazel eyes (sometimes called hazel brown eyes), the prevalence is even higher.īut the high prevalence doesn't mean all brown eyes look the same. In the UK, an estimated 22 percent of the population has brown eyes - including dark brown eyes, light brown eyes and honey brown eyes. But in Europe, both the prevalence and shade of brown eyes vary significantly from region to region. Dark brown eye colour also is very common in the Middle East. Most people living in Africa and Asia have dark brown eyes. But the prevalence of brown eyes varies significantly with geography. Brown eyes are more common worldwide than any other eye colour.
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