Brown Eye

The Commonest of Them All

Brown eye color is determined by a large amount of a pigment called melanin that is present there in the iris of the eye.

Now, how much this amount is, is determined by the genes controlling pigment production.

When the eye is brown, it has a good amount of this pigment, whereas a blue eye has less of it.

Brown was considered to be the most dominant eye color in any gene till quite recently.

But new studies have put a question mark to it.

Now, how the eye color genes exactly interact with one another; through recessing, dominating, expressing themselves midway, or simultaneously full together; is not absolutely clear yet.

It seems there are some missing links yet to be discovered in order to understand the exact pattern of the eye color inheritance to be determined genetically.

Eye color genes produce enzymes which decide for the amount of melanin in the iris.

At the physiological and the anatomical level, the eye color is determined by the amount of a dark brown pigment - named melanin - present in the iris of the eye.

If the amount is much, a dark brown eye or even a black eye is shaped.

If the amount is scarce, it ends up into a blue eye.

With in-between amounts, it may turn into a gray eye, a green eye, a hazel eye or a light brown eye.

If the amount is nil, the eye color takes its hue from the blood vessels in the back of the eye and appears to be a pink eye. Albinos are the example of this.

A very dark brown eye turns to appear as a black eye depending on the amount of melanin present in the iris.

In fact, the brown eye is the commonest of all the eye colors throughout the world.

In some large geographical areas; like Asia and Africa, and even in the Americas among its original inhabitants; the brown eye color is the rule, and rest all is an exception only!

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