Why Do People Have Different Eye Colors?

Why Do People Have Different Eye Colors?
Why Do People Have Different Eye Colors?

Video: Why Do People Have Different Eye Colors?

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The iris of the eye is its thin movable diaphragm with a pupil in the center. It is almost impenetrable, located behind the cornea and in front of the lens, between the anterior and posterior chambers of the eye. The membrane contains melanocytes (pigment cells), radial muscles that dilate the pupil, and circular muscles that constrict it.

Why do people have different eye colors?
Why do people have different eye colors?

The color of the iris depends on the amount of pigment and the blood filling of its vessels. Pigments can indicate a disease, for example, yellow or brown pigment appears in liver disease. The color of natural pigments depends on genes, nationality, race.

The color of the iris is determined by mixing the color of blood in the vessels and mixing the color of pigments, for example, green is a mixture of yellow and blue. People do not have yellow eyes, but if the blood vessels of the iris are pale in color, then you can get a yellow-green color. With a high concentration of melanin, the iris becomes black, gray is a kind of blue.

It happens that a person has eyes of different colors. This phenomenon is called heterochromia. The difference in color appears due to a lack (excess) of melanin. This phenomenon occurs in both humans and animals (cats).

Heterochromia is of two types: complete and partial. Complete heterochromia occurs when the color of the iris is completely different from the color of the "iris" of the other eye. Partial heterochromia is very rare, in about 4 people out of 1 million, then one part of the "iris" differs from the rest of it, ie. one eye combines two colors.

Heterochromia occurs after the fertilization of the cell; it does not in any way affect human health. People with this phenomenon see everything around and perceive it like everyone else. Most often it occurs in the fairer sex than in men. There have been cases that heterochromia became acquired due to illness or injury (Waardenburg syndrome or Hirschsprung's disease).

People with heterochromia acquire a certain zest, among them there are many famous and popular singers and actresses: Kate Bosworth (sectoral heterochromia), David Bowie (pseudoheterochromia due to trauma), Christopher Walken, etc.

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