Each person's eye color is a unique characteristic that is determined by the degree of pigmentation in the iris. As a rule, both eyes have the same color at their disposal, but there is an abnormal pigmentation, which is called “eye heterochromia”.

Such an anomaly can be transmitted from generation to generation and only manifest itself over time. Heterochromia is not always a unique adornment of the look, it can be a symptom of some pathological processes... In general, this is a rather rare anomaly that occurs in only one percent of the world's population. Moreover, in most cases, one eye is blue, and the other is brown.

What else is heterochromia called in ophthalmology? Experts call the different color of eyes in people piebaldism. In women, the anomaly is more common, although there are no anatomical and physiological prerequisites for this. So why do people have different eye colors?

Why do people have different eyes?

Piebaldism develops as a result of a lack or, conversely, an excessive amount of melanin in the iris of the eye. The more melanin, the darker the eye, and the less, the correspondingly lighter.

One of the harmless causes of Piebaldism (as discord is called) is a genetic predisposition

Other reasons can provoke the appearance of an anomaly:

• fuchs syndrome. The disease is characterized by inflammation of the blood vessels in the eyes. The process causes blurred vision and deterioration of vision, up to complete loss;
• injury. Usually light eyes darken, acquiring a brown or green tint;
• neurofibromatosis;
• glaucoma;
• penetration of a foreign body;
• oncological processes: melanoma, neuroblastoma;
• hemorrhage;
• atrophy of the iris;
• siderosis - iron deposition occurs in the eyes;
• side effect some medications, namely antiglaucoma drugs.

This is an acquired ophthalmic disorder, which is characterized by a unilateral lesion. Fuchs's syndrome is characterized by a slow course of the inflammatory process in the iris. It is characterized by a change in the periods of remission and relapse. Fuchs syndrome is more common in older people.

The disease progresses slowly and is difficult to detect for a long time. Usually, an anomaly is discovered by chance, perceiving it as a congenital defect. Important in diagnostic value the symptom is a slow deterioration in vision in the affected eye and the appearance of floating opacities. The lens becomes cloudy over time, due to thinning, the iris becomes lighter. It is even possible to develop secondary glaucoma. The affected eye becomes darker than the healthy one.

Fuchs syndrome causes noticeable nodules in the iris. The appearance of spots may indicate the development of atrophic changes in the posterior pigment layer. As the pathological process progresses, the iris becomes faded and dull.

Fuchs syndrome threatens the development of glaucoma and cataracts

Fuchs syndrome does not cause painful sensations, redness and swelling, which is why it remains unnoticed for a long time. The pathological process can be the result of a variety of reasons:

• inflammation inside the eyeball;
• neurodystrophy of the vessels of the eye;
• ocular toxoplasmosis.

Heterochromia can be corrected with colored lenses and visual acuity with glasses. Conservative therapy includes the use of nootropic, angioprotective, vasodilating agents and vitamin complexes... Treatment should be aimed at activating trophic processes in the iris of the eye. Corticosteroids may also be given topically. In advanced stages, surgical intervention is used.

Prolonged exposure to iron-containing objects in the eye can lead to the deposition of organic and inorganic salts. The iron-containing splinter slowly dissolves and permeates the tissues of the eye. The first symptoms of sideriosis can be detected several months after the introduction of the splinter. Treatment consists of removing the foreign body.

Multi-colored eyes can be the result of siderosis

Neurofibromatosis

Signs of a pathological process appear in the first years of a child's life. Boys get sick much more often than girls. Neurofibromatosis can be accompanied by a deterioration in intelligence and the appearance of epileptic seizures. Patients have spots on the skin of the color "coffee with milk".

Ocular manifestations occur in twenty percent of cases and are sometimes the only manifestations of the pathological process. Symptoms largely depend on the location, size, and number of neurofibromatous nodes. In the conjunctiva of the eyelids, they look like strands; in the mucous membrane of the eyeball, neurofibromas look like separate beads.

Varieties

Depending on the causative factors, the anomaly in humans is of two types: acquired and congenital. If heterochromia is associated with damage to the iris, then it is divided into simple and complicated. Depending on the degree of staining of the iris:

• full, when one eye is blue and the other is brown. In this case, the iris is colored evenly;
• sector, or partial. In this case, the iris has several shades. In the iris of one eye, areas of different colors are combined;
• central heterochromia. This means that the iris has several full color rings. This is the most common form in which pigmentation is disturbed in the area around the pupil.

People with in different colors the eyes continue to see and perceive colors absolutely normal

Diagnostics and treatment of people with different eyes

Regardless of the patient's assumptions regarding the nature of the occurrence of heterochromia, the first stage of the treatment process is to contact a certified ophthalmologist. An anomaly can be a symptom of serious pathological processes that require early diagnosis and timely started treatment. To identify pathological changes in the tissues of the eye, laboratory and specialized examination is carried out.

If the ophthalmologist finds that the patient has eyes of different colors, but the vision does not deteriorate and there are no other clinical symptoms, then treatment may not be prescribed at all.

If the eyes become a different color due to ophthalmic diseases or a violation of the integrity of the iris, then treatment includes the use of steroid drugs. In some cases, the removal of the vitreous body will be required. As an auxiliary therapy, anti-inflammatory, miotic and antibacterial drugs can be prescribed.

Have you met people with different eye colors? Sometimes this can be a hereditary feature of the patient, but in some cases this anomaly is associated with serious diseases that require timely intervention by specialists. Do not self-medicate, contact a specialist and follow his recommendations.

Most often, we pay attention to the eyes when we meet someone. No wonder they are called the mirror of the soul. And, of course, we immediately notice their color. Unusual, bright iris shades always attract attention. We are used to the fact that the left and right eyes are the same color. But it happens that they are different, for example, brown and green.

Our iris has several basic colors: brown, gray, light blue, blue, green, black, olive, amber (hazel). The most common eye color on earth is brown, since it is carried by representatives of two large races that make up the main population of the planet - the Negroid and Mongoloid. The rarest color of the iris is green, found in only 2% of the inhabitants of the Earth. There are also variations such as turquoise or emerald. But there is another rare category of people who have eyes of different colors. These can be such options: blue and brown, green and gray, and others. This anomaly is called heterochromia, and it occurs in only 1% of the population.

What is eye heterochromia?

Heterochromia is a different color of the iris in the left and right eyes, or an inhomogeneous color of areas of the iris in one of them. Its tone is determined by the concentration and distribution of melanin in the anterior (mesodermal) layer. In the case of eye heterochromia, this pigment is either not enough, or, conversely, it is present in excess.

In the overwhelming majority of cases, this is a congenital anomaly, and only sometimes (for example, in case of cataract disease, trauma to the organs of vision, hemorrhage in the tissue of the organs of vision, Fuchs syndrome and for other reasons) the pigmentation of melanin may be disturbed.

Acquired heterochromia can be corrected with surgical intervention, but congenital cannot be cured. This disease also has various forms.

Types of eye heterochromia in humans

This pigmentation disorder also has several varieties that differ visually, and also have different causes and consequences.

Complete heterochromia

The most common type is when a person has two uniformly colored irises of different colors. The most common variations are a combination of hazel and green, hazel and blue. This is a congenital feature that does not pose a threat to the organs of vision. With her, a person sees as well as people with the same color of eyes.

Sector heterochromia (partial)

It is caused by staining one of the eyes in different tones. With this form of iris heterochromia, there can be as many options as you like: in half, in quarters, there are wavy borders (a rare case). This is due to the uneven distribution of melanin during the formation of color in the first six months of life.

Central heterochromia

With this deviation, several clearly pronounced rings of different colors can be distinguished. It looks quite original, and some do not even suspect that they have a rare iris pigmentation abnormality, proud of their unusual eyes.

Metallic heterochromia

A rare species caused by mechanical damage. It occurs when metal particles (bronze, copper) get into the upper layer of the iris or sclera. Such foreign body a few microns in size is insensitive to the eye. Over time, the iron element, being in a humid environment, begins to oxidize and leads to the formation of a pigment, usually a rusty green or light green hue. Even when the scale is removed, the phenomenon does not disappear. Usually this type of anomaly occurs in people associated with the production of metals.

Heterochromia in animals

Almost all fauna, except for birds and reptiles, is subject to this unusual phenomenon. Among domestic animals, it is found in black or white cats, in dogs of only certain breeds, for example, huskies or malamutes. Unlike heterochromia in humans, animals have only one type of this disorder - complete, sector or central absent.

How can heterochromia threaten eye health?

The amount of melanin in the iris, of course, cannot in any way affect the quality of vision. But there are times when the change in pigmentation is caused by any disease, for example, Fuchs syndrome (which can lead to the development of cataracts or glaucoma), siderosis or chalcosis (ingestion of copper salts in the iris).

If you notice a change in its color, then this is a reason to consult a doctor to find out the reasons. This fact suggests that some kind of violation has occurred in the body's work, and this is only an indicator. With congenital heterochromia, nothing threatens the eyes.

Heterochromia of Human Eyes: How to Treat?

Let's say right away that if this anomaly is congenital, then it cannot be treated and corrected. With the help of the operation, it is possible to get rid of only the defect acquired due to any reason. In all other cases, there is a high probability that the color of the iris will be restored to you, but this, again, depends on the reason. With the above-mentioned metallic heterochromia, it will no longer be possible to correct it. Despite this, many people consider such a feature even piquant and pride themselves on being different from the rest. Central heterochromia or sectorial looks especially unusual and interesting.

Many celebrities are also not shy about heterochromia. For example, Mila Kunis, Mila Jovovich, Demi Moore and other famous Hollywood stars have eyes of different colors and believe that this unusual fact to some extent even contributed to their popularity, attracting attention. For filming, they use means of contact vision correction, and the rest of the time they feel great.

Contact lenses for the correction of heterochromia

The easiest and safest method to correct this violation is to use modern decorative optics for this. Ophthalmic product manufacturers offer a huge range of contact tinted and colored lenses with which you can hide this defect. Some people with complete heterochromia (for example, one eye is blue and the other brown) buy models of the desired colors and change the iris the way they want it. If, at the same time, a person has myopia or farsightedness, then he can purchase lenses with the appropriate diopters. If you have good vision, you can simply select the 0.00 option with zero power.

So, heterochromia - a congenital pigmentation disorder of the iris - does not threaten any health consequences, if it is not a consequence of any internal diseases or mechanical damage. People with this ailment themselves have different attitudes towards it. Someone considers this a piquant feature and does not hide it, someone wears decorative lenses to hide different eyes. But congenital heterochromia of the iris membrane can be called rather a rare, unique gift from nature. Many people born with her are gifted, creative individuals, and the example above proves this.

One of the amazing features of a person that immediately attracts attention is the eyes of different colors, which in medicine are called heterochromia. There is something mysterious, unknown and even mystical in this, it seems that their owner possesses unique knowledge and information that is inaccessible to ordinary people. The likelihood of meeting a person with multi-colored eyes is small, since, according to statistics, out of 1000 people, only 11 have this color.

short information

Since ancient times, people with such an anomaly caused fear among others, they were considered sorcerers, witches and even the descendants of the devil. They were persecuted and accused of all the misfortunes and troubles happening around. So, if suddenly a fire, flood or other natural disaster happened in the village, the owner of eyes of different colors was always considered to be guilty. Mothers who gave birth to children with different colors of the iris got no less - they were credited with having a love affair with Satan. People with different eye colors caused fear in others, so a superstitious person always tried to bypass them. If a meeting with them was inevitable, then special prayers and conspiracies from damage and the evil eye came to the rescue.

At present, science has made great strides forward and physicians can answer the question of why people have different eyes. Now persons with heterochromia are not persecuted, but, undoubtedly, they attract the attention of others. Most of the owners of eyes with different iris colors are complex and consider this to be their disadvantage.

However, some of them turn anomaly into dignity and are proud of their uniqueness, complexes are alien to them.

What is heterochromia?

Scientists have studied this phenomenon for a long time and found an answer to the question of what heterochromia is. Multi-colored eyes do not appear due to obsession or other influence of otherworldly forces. Such an unusual color arises from too much or negligible content in the iris of the pigment melanin, which is responsible for a certain shade of the eyes in humans.

The color of the iris is formed by only 3 pigments: yellow, blue and brown. Depending on the concentration of each of them in it, a person has a specific eye color. Each person suffering from heterochromia has a unique form, but scientists divide the anomaly into several large groups, each of which will have its own name. So:

1. Complete heterochromia - those same multi-colored eyes. The most common combinations are with blue eyes.
2. Sectorial, which is also called partial heterochromia of the eyes, with this deviation, the iris is characterized by coloring in several contrasting shades.
3. Central - a deviation in which several pronounced rings can be distinguished on the iris, each of them differing in color from the others.

Heterochromia is not a disease, but an anomaly of the eyes, so you should not be afraid of it. It does not pose any danger: it does not affect vision, does not distort the color and shape of surrounding objects.

Occasionally, having this abnormality can be a sign of other eye problems.

Why does heterochromia occur?

It is impossible to answer unequivocally why some people have eyes of different colors. Scientists agree that such an anomaly is nothing more than a game of nature. However, there are 3 main reasons for its occurrence. Among them:

1. Simple heterochromia, or congenital, when a person has different eyes from the moment of birth, while violations in the functioning of this organ are not observed. Such an anomaly in its pure form is rare.
2. Complicated heterochromia often develops against the background of Fuchs syndrome. With such a disease, one eye is affected in humans, while heterochromia may be mild or absent altogether.
3. Acquired heterochromia, when the discoloration of the iris is caused by trauma, inflammatory process, swelling, improper use of ophthalmic drugs and various mechanical damage... For example, this happens when a microscopic particle of copper or iron gets into the eye. In the first case, there is a high probability of developing chalcosis, in the second, siderosis, while the color of the iris will acquire a greenish, bluish, brownish or rusty tint.

Diagnosis and treatment of anomalies

Anomaly is diagnosed by observation, its signs are noticeable with the naked eye from the moment of manifestation. After detecting a different eye color, the doctor conducts a comprehensive examination using laboratory tests and special techniques aimed at identifying violations in the work of the visual apparatus. Only after that, the specialist makes a diagnosis, says the name of the disease, and prescribes treatment.

If a different eye color is the only anomaly that is observed in the patient, and no other abnormalities were found during the examination, drug treatment and surgical intervention is not prescribed. This is simply not necessary, because to fix this defect modern medicine beyond the power. If, during the examination, diseases are identified, the consequence of which is heterochromia, then the doctor will prescribe the necessary treatment.

Thus, if heterochromia is an acquired abnormality, then it will be possible to restore the color of the iris, but this can take a decent amount of time. But people with multi-colored eyes from birth will never be able to correct their color. As practice shows, most consider such a feature to be a flaw in appearance, few want to attract the attention of others. Such people may be advised to correct their eye shade with colored contact lenses. Nowadays, they can be purchased in any optics and even tried on before buying. Properly selected lenses will be completely invisible to others and will help a person with heterochromia get rid of complexes. Before going for contact lenses, it is recommended to consult with an ophthalmologist to make sure there are no contraindications to wearing them.

Heterochromia and human character

Popular wisdom says that congenital heterochromia leaves an imprint on a person's personality.

There are no people without flaws, and representatives with multi-colored eyes are no exception. Their main drawback is selfishness. This explains the extremes inherent in their behavior - they either withdraw into themselves and consider this feature a huge flaw, or they emphasize it in every possible way, striving to be in the spotlight. Such people want a special attitude and increased attention to their person. However, this does not prevent them from having a narrow circle of close friends whom they truly love and enjoy spending time with.

Different eye colors in people indicate their resentment, so you need to be extremely careful with statements about them. Of course, they know how to forgive, but they will remember the offense for a very long time. They also do not know how to speak in hints and do not understand them, they always say directly everything they think, sometimes thereby offending others.

In addition, they are very creative individuals: they love to sing, dance, write poetry and draw. They appreciate the holidays, going on a visit and receiving them in their home. In general, they are very outstanding and interesting people, so they definitely should not be complex because of their appearance. They are very loyal to those they love and will always lend a helping hand if required.

Heterochromia(from the Greek. ἕτερος - "different", "different", χρῶμα - color) - different colors of the iris of the right and left eyes or unequal color of different parts of the iris of one eye. It is the result of a relative excess or lack of melanin (pigment). Also, heterochromia means a different color of the skin or hair.

Eye color, that is, the color of the irises, is determined primarily by the concentration and distribution of melanin. The eye affected by heterochromia may be hyperpigmented or hypopigmented.

In newborn babies, eye color is often brighter than usual. Almost always, the eye dulls with age. But sometimes it can retain color depth. This is a rare occurrence but is more common with complete heterochromia, although the chances of this phenomenon are still small.

Classification and causes of occurrence

Heterochromia is classified primarily as genetic or acquired. Although a distinction is often made between eye heterochromia: complete(Greek heterochromia iridis) and partial... At complete heterochromia the color of one iris is different from the color of the other. At partial heterochromia or sectoral heterochromia the color of one part of the iris differs from the color of the rest.

Congenital heterochromia

As a rule, it is inherited in an autosomal dominant manner.

• Simple heterochromia is a phenomenon characterized by the absence of other ocular or systemic problems. Abnormally light eyes are commonly considered iris hypoplasia. It can manifest itself both completely and partially.
• Waardenburg syndrome
• Horner's Syndrome
• Piebaldism - the presence of congenital white spots, completely devoid of melanocytes, on the skin of the limbs, face and some other parts of the body; inherited in an autosomal dominant manner and is caused by various mutations
• Hirschsprung's disease
• Bloch-Sulzberger syndrome
• Parry-Romberg disease (Romberg syndrome)

Acquired heterochromia

It is usually acquired from trauma, inflammation, swelling, or the use of certain eye drops.

Abnormal darkening of the iris

• Corneal iron deposits - Siderosis(iron deposition in the tissues of the eye) and hemosiderosis
• Certain eye drops, which are used externally to reduce intraocular pressure in patients with glaucoma. Occurs due to stimulation of melanin synthesis in the iris
• Tumor
• Iridocorneal endothelial syndrome

Abnormal lightening of the iris

• Fuchs heterochromic iridocyclitis - as a result of intraocular inflammation, atrophy of the iris occurs and heterochromia characteristic of this state occurs
• Horner's syndrome - usually acquired due to neuroblastoma, but it can also be congenital
• Melanoma can also cause lightening of the iris.

In addition, heterochromia can be caused by Stilling-Türk-Duane syndrome, mosaicism, uveitis, juvenile xanthogranuloma, leukemia and lymphoma.

Heterochromia in animals

Complete heterochromia

Heterochromia is more common in animals than in humans. It usually results in a blue color in one eye.

Eyes of different colors can be found in completely white cats or in cats with a high percentage of white in color, especially in breeds such as the Van cat and the Turkish Angora. Cats with different colored eyes are called mismatched. In odd-eyed cats, one eye is orange, yellow or green, and the other eye is blue.

According to legend, the beloved cat of the Prophet Muhammad - Muizza had eyes of different colors.

In domestic dogs, heterochromia is common in the Siberian Husky breed.

Horses with complete heterochromia usually have one brown eye and the other white, gray, or blue eyes. Complete heterochromia is most common in piebald horses. It is also found among cows and Asian buffaloes.

Sector heterochromia

Sector heterochromia is common in Australian Shepherd, Husky and Border Collie breeds.

Known cases of heterochromia

Kate Bosworth, Tim McIlroth, Mila Kunis, Alice Eve have heterochromia.

Among the literary examples of heterochromia are the books "Magicians Can Do Anything" (all magicians with innate abilities have eyes of different colors), "Four Tankmen and a Dog" (in the book, different eyes for the tank commander Vasily Semyonov), "White Guard" (Lieutenant Viktor Myshlaevsky) and The Master and Margarita (Woland) by Mikhail Bulgakov. In the literary series Ethnogenesis, heterochromia is used as an indicator of the wearing of a particular magical artifact by the heroes.

Many characters in computer games, cartoons and anime have heterochromia.

Gallery

Different eye color

Eye color depends on the blood filling of the vessels of the iris and the amount of pigment contained in it. This diaphragm, thin with a pupil, is located in front of the lens and behind the cornea. The color of the pigment may indicate a disease in the body. For example, with liver disease, the iris becomes yellow or brown. The natural color of pigments depends on genes and race. It can also be characteristic feature of any nationality. There are only three pigment colors. It is brown, blue and yellow. The mixing of these pigments in the blood vessels determines the color of the eyes. For example, mixing blue and yellow produces a green color scheme.

Different eye color

Sometimes there is an excess or lack of melanin in the iris. Then a phenomenon called heterochromia is possible, the manifestation of which is a different eye color. This condition occurs in both humans and animals. Most often, the color of one eye is brown, and the other is blue. But still, each person has his own, unique form of heterochromia. Such people look mysterious and unusual, standing out from the crowd.

Heterochromia happens:

1. Complete when the colors of the irises of the eyes are different.

2. Partial, in which one pupil combines two colors.

Eyes of different colors in cats are no longer surprising. This phenomenon is familiar to us. Eyes of different colors are much less common in humans. Heterochromia can be congenital, resulting from excess or lack of melanin. But there is also an acquired condition as a result of trauma, in people with tumors or glaucoma.

From a psychological point of view, people with different eye colors are considered extraordinary, unpredictable and fearless. However, they have a pronounced egocentrism. Demanding much attention to their personality, they like to be alone with themselves. As a result, they have a very narrow circle of close people.

Women with different eye colors always strive for perfection. They love to enjoy their appearance, considering it perfect. Possessing a delicate taste, they are fond of poetry, music, dancing and are great optimists.

People with different eye colors lead a measured lifestyle. Bright events are rare for them. But this is not upsetting. Thanks to their inexhaustible imagination and wonderful organizational skills, they can always arrange a holiday for themselves.

Women with different eye colors are always looking for their own unique and unique. And only with him will they be wise and wonderful housewives, creating such comfort and coziness in the house that the husband can only be envied. But at the same time, these women will never forget to carefully monitor their appearance.

In such ladies, by nature, an addiction to alcohol is inherent. But by virtue of their wisdom, they can easily defeat this craving. But having tried smoking, they are unlikely to be able to quit.

When communicating with people with different eye colors, do not forget that they are very capricious and stubborn. It is unlikely that you will be able to emerge victorious in a dispute with them. They may even be rude in their desire to prove their case.

In dealing with such people, you must carefully choose your words. They will quickly forgive, but the resentment will persist for a long time.

Heterochromia should not be perceived as a disease or mutation. Different eye colors do not affect health in any way. A person with heterochromia perceives the colors of the surrounding world absolutely normally and sees as an ordinary person.

Interesting and explainable: a person with different eye colors

First of all, it should be noted that a similar phenomenon occurs in the animal world by an order of magnitude more often than in the human world. For example, among cats of the Persian breed, a different eye color is considered a very common sign (usually one is bright orange, and the other is blue, which looks very unusual). A person with different eye colors can rightfully be proud of his peculiarity, because if you believe the research, the character of such individuals is unpredictable and impetuosity. Often such people are fearless, they like to surprise, make an impression. Of the shortcomings, one can note the hypertrophied Ego: "disagreements" are often fixated on themselves. They simply cannot live if those around them do not pay enough attention to their person. If your new acquaintance is a person with different eye colors, you can be sure: he loves loneliness and prefers to spend his free time with a narrow circle of close friends. Perhaps from the outside he looks stubborn and capricious, but as soon as you get to know him better, then make sure that this is not at all the case.

Women with multi-colored eyes

According to statistical studies, girls with different colored eyes tend to be overweight. However, this does not prevent them from treating themselves with reverence: "disagreements" love themselves and are determined to get maximum pleasure from life. They love parties and entertainment and never miss an opportunity to shine. Another positive quality of them is patience. A woman with multi-colored eyes, most likely, will not complain about life for a long time and tediously; she will prefer to do everything to resolve the unpleasant situation. Most of them are creative people. Whatever they put their hand to is fruitful. They sing, dance, draw, sew, knit - in all such areas, "disagreement" will be successful.

Marriage

A person with different eye colors is more likely to be fickle in love. However, this only lasts until he meets his other half. Once this happens, your acquaintance will change so dramatically that it will be difficult to recognize him. From this moment on, he will live only for the sake of his beloved being and will do everything to surround him with care and attention, to make his life as comfortable as possible.

Relationship with parents

If a child has eyes of different colors, you can rejoice: according to statistics, people with multi-colored eyes treat their parents very warmly, never conflict with them, spend time with their family with pleasure. They are touchy, but easily forgive and never conceal resentment.

Causes of the phenomenon

Probably, every person with a different eye color wants to know about the reasons for his "peculiarity". By and large, there are two of them: the phenomenon can be congenital (and can be explained by genetics) and acquired (this indicates changes in the body, most often unhealthy).

Heterochrony

Any ophthalmologist will answer the question of what the different eye color is called: heterochrony. In most cases, it is caused by an excess or lack of melanin and accompanies diseases such as glaucoma or even a benign tumor. In addition, a change in eye pigmentation can be a reaction to medication.

Why do people have two eyes of different colors?

I have seen people who have one green eye and the other yellow green, etc. why does this happen ??

Lyoka

Heterochromia of the iris (heterochromia; heterochromia + Greek chroma color, color; syn. Heterophthalmos) - a different color of the iris of the right and left eyes or unequal color of different parts of the iris of one eye.
People with different colored eyes are called mosaics.
The different color is explained by the mutation of the embryo after fertilization of the egg. That is, a mutation in the blastula even before the formation of the endoderm. The earlier the mutation occurs, the more vividly it manifests itself in appearance.
The owner of eyes of different colors has nothing to fear - this does not mean any disease. This is just a play of nature. In some people and animals, although this phenomenon is quite rare, eyes of different colors are found. Despite the apparent asymmetry of the face, caused by different eye colors, such animals and people may have features that distinguish them from other individuals, but with eyes of the same color.
Recently, it was noticed that people and animals with such a multi-colored combination of the iris of the eyes have a certain "magical power" to attract the opposite sex of their species. For example, "odd-eyed" cats very easily get the attention of the person they are interested in. As for people, many who are familiar with disagreements noted that they have some kind of "zest" and charm.
So, those who were born with multi-colored eyes should not despair, but use their natural external charm for their own purposes to achieve success in business and in personal life.
And here's a concrete example - David Bowie.

If a person has different eyes?

* Kisunya *

"Heterochromia of the iris (heterochromia; hetero- + Greek chroma color, color; syn. Heterophthalmos) is a different color of the iris of the right and left eyes or unequal coloration of different parts of the iris of one eye. People who have eyes of different colors are called mosaics.

It is the result of a relative excess or lack of melanin (pigment). Partial or sector heterochromia is less common than complete heterochromia, less than 4: 1,000,000.

The different color is explained by the mutation of the embryo after fertilization of the egg. That is, a mutation in the blastula even before the formation of the endoderm. The earlier the mutation occurs, the more vividly it manifests itself in appearance. The owner of eyes of different colors has nothing to fear - this does not mean any disease. This is just a play of nature. In some people and animals, although this phenomenon is quite rare, eyes of different colors are found. Despite the apparent asymmetry of the face caused by different eye colors, such animals and people may have features that distinguish them from other individuals, but with eyes of the same color. For example, It has been noticed that "odd-eyed" cats very easily achieve the attention of the person of interest. As for people, many who are familiar with disagreements noted that they have some kind of "zest" and charm. "

The human eye has the shape of a ball, due to the somewhat convex front. The eyeball is located inside, which is lined with a shock-absorbing fat layer. Anatomically, the eye is an internal gelatinous nucleus surrounded by three membranes. Its outer shell - - is the most dense, the front transparent part of it is called the sclera. The middle (choroid) membrane includes the ciliary body itself and. The iris looks like a flat ring and delimits the front and back. There is a hole in its center -. It is the iris that determines the color of a person's eyes. The inner shell of the eyeball is called, there are light and color-perceiving elements.

What determines the color of human eyes

The iris is a structure practically impervious to light. The content of melanin pigment in it, as well as its distribution, determines the color of the eyes in humans - it can be from light blue to dark brown and almost black. It is extremely rare with congenital pathology - albinism - the iris does not have melanin, and due to the translucence in its blood vessels, the eye may have a red color. Albinos suffer because the iris does not protect the eye from excess light rays. People with blue eyes have little melanin in the iris, while those with darker eyes have a lot. Eye color is determined by heredity, and the overall pattern and shade are individual.

In newborn babies, eye color is generally light. The final color is formed during the first two years of life. Among the peoples of the northern regions, light eye color is more common, residents of the south are more likely to have dark eyes, in middle lane light brown, gray-green color prevails. Such features allow a person to better adapt to life in conditions of bright illumination and a large number of rays reflected from the surface of snow and ice.

Eye color and its meaning

Despite many beliefs and legends about the characteristics of people with different eye colors, in practice, such patterns are usually not confirmed. For example, neither intellectual ability nor visual acuity depend on eye color.

Aristotle believed that a person with dark green or brown eyes has a choleric temperament, with blue eyes - phlegmatic, and with dark gray - melancholic. It is believed that people with dark eyes have strong immunity, are distinguished by endurance, tenacity, but they can have an explosive temperament and be overly irritable. People with gray eyes have perseverance in achieving their goals, decisiveness, with blue eyes - they endure adversity more easily, brown-eyed people are closed, and with green eyes - they are distinguished by concentration, constancy, decisiveness.

It is a well-known historical fact that blue eyes are the hallmark of the Aryans - representatives of the true Nordic race. The German theorist G. Müller is the author of the famous expression: "A healthy German with brown eyes is unthinkable, while Germans with brown or black eyes are either hopelessly ill, or not at all Germans." In the east, it is believed that only light-eyed people can "jinx", in the middle lane it is said about dark brown and black eyes.

Eyes of different colors

Rarely does one person have a different eye color. This is called heterochromia. The left and right eyes can have completely different colors (complete heterochromia), or the color of only part of the iris can differ (sector heterochromia). This condition can be acquired or congenital. This phenomenon has many literary references, and, perhaps, the most famous character in different eye colors is Bulgakov's Woland.