People with lighter coloured eyes may struggle to hide their emotions. This is due to the eye dilating and contracting when their moods change. With brown eyes it is not as easy to read the eyes giving them the advantage of being able to hide their moods better. As a result, people with brown eyes can often be perceived as mysterious.
Studies in the United States have shown that women with brown eyes tend to tolerate the pain of childbirth a lot less than folk with lighter coloured eyes. They are also said to suffer depression and anxiety after childbirth. This could be the result of the NCX-4 gene that is linked to brown eyes and controls a protein linked to pain receptors.
As we know, melanin can sometimes double up on its task. According to more studies, the higher amount of melanin in people with brown eyes protects nerves in the brain from damage caused by noise. In short factory workers who work in a noisy environment might suffer hearing loss more than their fellow co-workers in the same working environment.
We all in fact have brown eyes. The colour we all see however is directly related to the amount of melanin on the iris of the eye and how it reflects light. Those with lower amounts of melanin absorb less light and reflect more light back out at shorter wavelengths along the blue end of the spectrum, giving the eyes the appearance they are blue.
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