Photos of students with hazel or green eyes were excluded. Only photos of individuals with blue eyes or brown eyes were used in the study. All photos were cropped so that the eyes were always horizontally at the same height with a standard length of neck visible. The students who were photographed were told to assume neutral, non-smiling expressions and not to wear any makeup or jewelry. Participants in the study were asked to rate the photographed students for trustworthiness on a 10-point scale. In research performed in the Czech Republic, university students were asked to look at photographs of 80 fellow students (40 males and 40 females, ages 19 to 26 years). (In most cases, polarized sunglasses offer the greatest comfort in bright sunlight.) Are brown eyes more trustworthy?ĭid you know that having brown eyes may make you appear more trustworthy?
So, be sure to wear sunglasses that protect your eyes from UV radiation outdoors if you have brown eyes. The women with light-colored eyes also had less anxiety, depression, negative thoughts and sleep disturbances than the women with brown eyes.Īlso, researchers in Australia found that people with dark brown eyes were more likely to develop cataracts than people with lighter-colored eyes. Research at the University of Pittsburgh found that women with dark-colored eyes seemed to experience more pain when giving birth compared with mothers with light-colored eyes.
The study authors felt melanin pigment may help protect nerves in the brain from noise-induced damage.īut it's not all good news for people with brown eyes. For example, people with brown eyes appear less likely to develop age-related macular degeneration than people with light-colored eyes.Īlso, people with brown eyes have a lower risk of type 1 diabetes and melanoma of the eye, compared with individuals with light blue eyes.Īnd research at the National Hospital for Neurology and Neurosurgery in London suggests people with brown eyes have less risk of hearing problems from environmental noise pollution than coworkers with blue eyes. People with brown eyes may be less vulnerable to certain diseases. If you have brown eyes, you'll be happy to know they have been associated with some health benefits. But within 12 to 18 months, more melanin can accumulate in the iris, causing eye color 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 color eyes a child might end up with.Īlso, the eyes of many Caucasian babies contain very little melanin at birth and will appear blue the first few months of life. So it's very possible for children in the same family to have different eye colors - including colors different than those of their parents. In fact, there is evidence that up to 16 genes can influence eye color. But predicting eye color 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 color is an inherited trait. Eyes with a bit more melanin are green, hazel or light brown. The amount of this pigment (called melanin) in the iris of your eye determines the color of your eyes.Įyes with very little melanin in the iris are blue. What causes brown eyes?Įven though there are different eye colors, including less common blue eyes and green eyes, there is only one type of eye color pigment. READ MORE about the most common eye colors.
There is plenty of variation in the appearance brown eyes (even within a given shade) from person to person. If you include hazel eyes (sometimes called hazel brown eyes), the prevalence is even higher.īut a high prevalence of brown eye color doesn't mean all brown eyes look the same. In the United States, an estimated 41% of the population has brown eyes - including dark brown eyes, light brown eyes and honey brown eyes. In Europe, the prevalence and shade of brown eyes vary significantly from region to region. Dark brown eye color 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 color.
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