A basic characteristic of man is his eye color. Whether brown, blue or green – that is, among other things stated in the passport. But why do people actually have different eye colors?
Iris and pupil
The iris and the iris is the colored part of the eye and is almost an aperture for the eye to dark. controls the incidence of light: it narrows in brightness – the light is so low. The iris acts like the iris of a camera. The activity of these muscles is controlled by nerves and unconsciously done for the people.
The pupil is the opening in the iris that lets light into the interior of the eye. In bright light the pupil is the smallest (1.2 mm) and greatest in the dark (9mm).
How then does the color of the eyes existence?
The pigment melanin, which determines the tone of skin and hair, is responsible for eye color. Depending on how much pigment is deposited in the cells, their eyes also get the individual color.
A high concentration of melanin results in brown eyes, these people usually have a darker skin than others. Conversely, you rarely see someone with dark hair and blue eyes. A smaller proportion of pigment makes the iris – depending on the dosage – appear green, blue or gray. The less melanin, the more a man has eyes bluer.
As a baby, we usually have blue eyes …
The final color is genetically determined. In the womb, the iris is still bright blue and later reached their full color. The reason: the pigment develops only in the first years of life in the body. This means that changes with increasing age and the eye color.
Eye color – an immutable characteristic
This process is then stopped, our eye color also remains the same. So who has brown eyes can no longer get blue and vice versa have also blue-eyed blue eyes of her life.
By the way: If you still want to try a different eye color, has this possibility with the so-called iris lenses.