Eyes of different colors : why it happens

Eyes of different colors : why it happens
According to statistics, about 1% of the total population of the globe has different colored eyes.This phenomenon is called "heterochromia" and caused a number of reasons, congenital or acquired.

Eye color is determined by the presence in the iris pigment melanin produced melantotsitami cells.From the concentration of colored pigment is dependent coloring of the iris.

In most cases, it is the same for both eyes and is represented by the basic colors (blue, yellow, brown) and their variations.But sometimes due to some internal or external factors, there is a failure, and the eyes are different colors.

Heterochromia is not unique to humans.It also occurs in the animal environment, such as cats and dogs.

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Species heterochromia

  1. complete.It appears completely different eye color (for example, a blue iris, and the second - karyaya).
  2. Partial.With this type of heterochromia one iris is present just two shades.One of these is dominant and the other is represented as blurred spots o
    r separate sector covers the iris.
  3. Central.In this case, different colors are combined in one eye so that the dominant group occupies a large part of the iris, and other color dye annularly center of the eye, creating a halo around the pupil.

Congenital causes of eyes of different colors

In most cases, heterochromia is under a genetic soil and is inherited.In this embodiment, due to mutations in the chromosomes of the baby is born already with eyes of different colors.

This anomaly does not affect the sharpness of his vision and not cause any problems, other than aesthetic.In today's world people have different color eyes, can benefit from corrective tint contact lenses if desired.

Sometimes genetic abnormalities lead to more serious violations, for which different eye colors are just one of the pathological symptoms.

For such diseases include:

  • degeneration of the cervical sympathetic nerve;
  • pigment dispersion syndrome;
  • Waardenburg syndrome;
  • Fuchs syndrome;
  • disease Sturge-Weber;
  • uveal melanoma;
  • Horner's syndrome;
  • Hirschsprung's disease.

eyes of different colors: Acquired causes

  • mechanical injury of the eyeball;
  • inflammatory diseases of the organ of vision;
  • malignancies;
  • leukemia;
  • iron deposition in tissues of the eye;
  • some side effects of eye medications.

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