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Physiological features that affect the color of the iris

The main pigment, which determines the hair color,A shade of skin and the color of the eyes of any person - melanin. Its concentration has a fundamental effect on the color of the iris of the human eye: the more melanin, the darker the eyes. Thus, in brown-eyed people, the maximum pigment concentration is observed, while in blue-eyed people the minimum concentration is observed. To a small extent, the color of the eye is determined by the concentration of the fibers of the iris itself. Here, too, a direct relationship is observed: the higher the concentration, the darker the eyes. The red eyes of albinos are characterized by a complete absence of pigment, resulting in visible blood vessels contained in the iris. The amount of pigment in the cells is affected by the hereditary factor. Dark color is a dominant feature, and light color is a recessive one. In the world, the largest number of people have brown eyes, and most rarely are green-eyed representatives of the human race, their only 2% of the total population of the planet.

At what age does the color of the eyes become permanent

According to the physiological characteristics of buildingsHuman body, the pigment is produced by special cells - melanocytes. Their activities do not begin immediately after the birth of the baby, but after a while. Thus, the pigment accumulates gradually, from day to day. That's why some parents note that the color of the baby's eyes changes almost daily. On average, the apparent changes in the color of the iris begin at the age of three months of the baby. Most often, the final color of the eye can be judged at six months of age. However, there are cases when the change in the amount of pigment can last up to two, and even up to three years. Sometimes a complete heterochromy arises in the body - an uneven distribution of the pigment. This leads to the fact that the eyes of the baby are painted in different colors. Partial heterochromia affects the coloration of different parts of the iris. However, small differences in the color of the eyes are not very noticeable. However, in case of occurrence of heterochromia, it is necessary to show the child to the ophthalmologist in order not to face the undesirable consequences of this disorder. To guess in advance what color eyes the baby will have is impossible. From the point of view of genetics, this sign is inherited according to the law of Mendel: brown-eyed children are born with brown-eyed children, and blue-eyed children have blue eyes. However, only time can give an accurate answer to this question.