Central heterochromia or hazel

Central heterochromia or hazel DEFAULT

Why are my eyes different colors?

Heterochromia is the term used to describe a difference in a person’s eye color. Someone with central heterochromia has different colors within the same eye. Complete heterochromia is when they have two different colored eyes.

Heterochromia of the eye is caused by variations in the concentration and distribution of melanin, the pigment that gives color to the skin, hair, and eyes.

The word “heterochromia” is derived from ancient Greek where “heteros” means different and “chroma” means color. The condition is also known as heterochromia iridis or heterochromia iridum.

What determines eye color?

Eye color is a result of melanin deposits in the iris, which is the part of the eye responsible for dilating and constricting the pupil to control the amount of light that enters. Blue eyes have small amounts of melanin while brown eyes are rich in melanin.

Iris color throughout a person’s life. For example, many babies are born with blue eyes that darken within the first 3 years of life. This change occurs as melanin develops.

Uneven distribution of melanin leads to central heterochromia and other types of heterochromia.

Causes

Most cases of heterochromia are present from birth when the condition is called genetic heterochromia.

suggests that most cases of heterochromia in humans are benign and occur without any underlying abnormality.

According to the Genetic and Rare Diseases Information Center, most cases of heterochromia of the eye occur sporadically in people with no family history of the condition.

However, some cases of genetic heterochromia are linked to diseases and syndromes, including:

  • Bloch-Sulzberger syndrome
  • Bourneville disease
  • Hirschsprung disease
  • Horner’s syndrome
  • Parry-Romberg syndrome
  • Sturge-Weber syndrome
  • von Recklinghausen disease
  • Waardenburg syndrome

Heterochromia that develops later in life due to illness, injury, or medication, is known as acquired heterochromia. This is less common than the genetic form.

Causes of acquired heterochromia include:

  • diabetes
  • eye surgery
  • glaucoma
  • injury to the eye
  • iris ectropion syndrome
  • pigment dispersion syndrome
  • Posner-Schlossman syndrome
  • swelling of the eye
  • tumors of the iris

In addition, a medication called latanoprost, which is used to treat glaucoma, has been associated with changes in eye color in up to of those taking it for 5 years or longer. Latisse, which is a drug once used to treat glaucoma but now primarily used to thicken eyelashes, may also account for a change in eye color.

Types of eye heterochromia

The different types of heterochromia of the eye include:

Central heterochromia

Central heterochromia is characterized by having two different colors in the same iris. Usually, the outer ring of the iris is one color while the inner ring is another.

The inner ring often seems to have “spikes” of different colors that radiate from the pupil or the black circle at the center of the iris. Eyes that have this pattern may be referred to as “cat eyes.” The outer color is considered to be the true iris color in people with central heterochromia.

Central heterochromia tends to occur in irises that have low levels of melanin.

Complete heterochromia

People with this condition have two different-colored eyes. For example, they may have one blue eye and one brown eye.

Sectoral heterochromia

In people with sectoral heterochromia, also known as partial heterochromia, one part of the iris is a different color from the rest. Sectoral heterochromia often resembles an irregular spot on the iris of the eye and does not form a ring around the pupil.

Identifying heterochromia

Heterochromia of the eye is easy to identify. The person will have two different colored eyes or color differences within one or both eyes.

Color differences may be slight and may only become apparent under certain lighting conditions or in photographs.

Aside from variations in eye color, there are usually no other signs and symptoms of heterochromia. However, if a medical condition or trauma is responsible for the heterochromia, other signs and symptoms may be present.

Diagnosis

Most cases of central heterochromia are benign. They are not linked to medical conditions and do not affect vision or lead to complications. However, a checkup is necessary to rule out other medical conditions.

People who acquire heterochromia and people whose genetic heterochromia changes in appearance should see an eye doctor.

An eye examination will usually be necessary, and other tests, including blood tests and chromosome studies, may be needed.

Treatment

According to the American Academy of Ophthalmology, if no other issues are present, treatment is not usually necessary. Colored contact lenses may be used for cosmetic reasons if a person with heterochromia wants to alter how their eyes look.

Notable people with central heterochromia

Several celebrities and public figures have forms of heterochromia.

The actors Olivia Wilde, Idina Menzel, and Christopher Walken all have central heterochromia, where the inner ring of the iris is a different color from the outer ring.

Notable people with complete heterochromia, where their two eyes are different colors, include:

  • Jane Seymour, actor
  • Alice Eve, actor
  • Max Scherzer, professional baseball player
  • Josh Henderson, actor
  • Mila Kunis, an actor who acquired the condition as an adult

Sectoral heterochromia, seen in only part of the iris, affects:

  • Kate Bosworth, actor and model
  • Henry Cavill, actor
  • Elizabeth Berkley, actor
Sours: https://www.medicalnewstoday.com/articles/

The Truth About Hazel Eyes

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By Cat Lafuente/Aug. 6, pm EDT/Updated: Dec. 15, pm EDT

Hazel eyes, arguably one of the most mysterious eye colors, are as unique as they are beautiful. And while hazel isn't exactly a color, per se — it's more of a pattern of colors within the iris — those lucky enough to be blessed with this phenotype can have a mix of brown, yellow, green, and blue in their irises. That's why no two pairs of hazel eyes are exactly alike and why each pair has their own nuance.

When it comes to celebs who are known for their hazel eyes, model Tyra Banks immediately pops to mind, with her piercing brown and green gaze. Or perhaps you think of actresses like Demi Moore, Shailene Woodley, and Jada Pinkett Smith, who all have equally arresting peepers. And, of course, there's singer Rihanna's dramatic hazel stare, which somehow manages to look a little bit different in every picture.

So what's the science behind this one-of-a-kind eye color? Is having hazel eyes common or is it more of a genetic rarity? And why is it that hazel eyes seem to change color or look different depending on a person's surroundings? Read on to learn the truth about hazel eyes.

What color are hazel eyes exactly?

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Whereas people with brown, blue, and green eyes usually only appear to have one color in their iris, people with hazel eyes have several, according to an article in Owlcation. Additionally, as previously stated, having hazel eyes is less about color and more about how color is distributed within the iris. And that can have some significant variation, as there's a lot at play when it comes to how hazel eyes appear.

Specifically, the hazel pattern begins with a ring of color around the pupil, usually brown. Then, as you move away from the pupil and out toward the rest of the eye, the color will shift into green, sometimes with an additional ring of amber in between. This burst-like pattern is what makes hazel eyes distinct from green eyes, which don't have the same kind of color shift and are monochrome in appearance. As noted by Owlcation, hazel eyes "may have a yellowish brown, dark brown or amber-brown surrounding the pupil."

That's not to say that people with different eye colors can't have variation in their irises, as they certainly can. But this unique variation is how it works for our hazel-eyed brethren.

Hazel eyes are all about the melanin

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Interestingly enough, as diverse as hazel eyes appear, there's actually only one color in the irises of people with hazel eyes and that's brown, according to All About Vision. That brown color comes from a pigment that's called melanin, which is responsible for how dark or light a person's skin is as well. The more melanin you have in your iris and your skin, the darker both will appear. That explains a lot.

Okay, but if there's only one color in a hazel iris, why do we see green, yellow, and sometimes even a hint of blue? You can chalk that up to the Tyndall effect, which is similar to the mechanism that makes both the ocean and the sky look blue. Essentially, the way that light is scattered combined with the amount and placement of melanin determines how hazel eyes appear. So where there's brown, there's a lot of melanin. Where there's yellow and green, there's less melanin and light being scattered in combination. And if there's blue, there's no pigment at all, at least not in the front layers of the iris. Fascinating, no?

Hazel eyes are not very common

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In addition to actors and models like Tyra Banks and Shailene Woodley, there are plenty of other celebs with hazel eyes out there. From Shad Moss (aka Lil' Bow Wow) to Heidi Klum, when you turn on your television, chances are you'll see plenty of hazel-eyed beauties and gents in both shows and commercials. That's not surprising, taking into account how unique and multi-faceted hazel eyes can appear, especially in their more rare expressions.

But chances are that hazel eyes are over-represented in the media, as not many people are lucky enough to have this distinct phenotype. In fact, only five percent of the world's population has hazel peepers, according to an article in World Atlas. That's in comparison to the 79 percent of people on earth who have brown eyes, dwarfing every other eye color with its dominance. And in addition to that, eight to ten percent of the world's population have blue eyes, most of them living in various European countries like Finland, Estonia, Ireland, and Scotland. So hazel-eyed folks, celebrate yourselves! You're a rare bird, indeed.

But hazel eyes are not the least common eye color

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Despite the fact that having hazel eyes is not very common, there are several other eye colors that are far more rare, according to an article in World Atlas. Given how complex and complicated genetics can be, that's not exactly a shock, though it certainly is an intriguing factoid. 

To start, roughly the same percentage of the world's population have amber eyes — five percent — thanks to lipochrome, a yellow pigment that makes the iris look yellow or coppery. However, this is more common in animals like dogs, fish, and birds than it is in humans. After that, folks with green eyes clock in at two percent, thanks to lipochrome, low melanin levels, and the way light scatters in the eye. 

Finally, there are three eye colors that are so rare that less than one percent of the population has them: gray eyes, red/violet eyes (often only in people with a severe form of albinism), and heterochromia (different-colored eyes). Truly those are one in a million.

This is why hazel eyes seem to change color

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If you have hazel eyes, or if you've looked at different images of people with hazel eyes, you've probably noticed that often hazel eyes appear to change color. That's certainly the case with Tyra Banks, for example, whose eyes can appear super green in some pictures, while they sometimes look more yellow and brown in others. The same is true for Jada Pinkett Smith, who passed on her riveting hazel peepers to her daughter, Willow Smith.

Of course, science has a reason for that. According to an article in Owlcation, hazel eyes change color based on environmental factors such as the color of objects in a room and the amount and type of light that is filtering into the iris. Additionally, the color shift is also dependent on how much melanin is in the iris. So if a person with hazel eyes with minimal melanin in their eye is wearing a green dress, their eyes will appear greener. And if a hazel-eyed person with a lot of melanin in their eye is wearing a brown dress, their eyes will look more brown. Boom, mystery solved!

Blue-eyed parents can have children with hazel eyes

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In elementary school, middle school, or high school, chances are you were taught that eye color is dependent on dominant and recessive genes, and were forced to diagram a bunch of Punnett Squares to prove it. It followed, then, that brown eye color is dominant over all other eye colors, including hazel. So according to that model of genetic determination, blue-eyed parents couldn't have brown-eyed offspring, and brown-eyed parents could only have blue-eyed (or green or hazel) offspring if they both carried the recessive gene for those eye colors.

But as it turns out, that model was way over-simplified in some ways and totally wrong in others. The newer, more current genetic research that's available about how we get eye color shows that there are 16 genes in play that make this determination. That means that eye color isn't determined by a simple recessive or dominant gene; rather, it's reliant upon variations of several genes and how they interact with one another. That's why it's possible for blue-eyed parents to have children with hazel eyes.

Do people with hazel eyes handle pain better than others?

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Although having hazel eyes is a beautiful thing, there are some things that come with this phenotype that aren't quite as lovely. For example, brown-eyed and hazel-eyed ladies are more sensitive to pain than lighter-eyed folks. Who knew eye color could be linked to something like that? There's no end to how unpredictable genetics are and how far-reaching the impact of them can be on people.

But they are indeed connected, according to an article published in The Journal of Pain. In the study, which was conducted at the UPMC Magee Women's Hospital, researchers surveyed a total of 58 expectant mothers who were planning to deliver their babies there. They divided the women into two groups, 24 in the group with hazel and brown eyes and 34 in the group with light-colored eyes. The aim was to study postpartum and antepartum pain, sleep, coping behavior, and mood.

The results? As it turns out, women with lighter eyes had an easier time giving birth than their darker-eyed counterparts. Additionally, they were less prone to anxiety and depression — all thanks to having less melanin in their irises. Wild, huh?

How can hazel eyes affect alcohol tolerance?

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Just as folks with hazel eyes are more sensitive to pain, they are also more sensitive to alcohol. Though it's a little more complicated than it sounds.

Specifically, people with brown or hazel eyes are more sensitive to alcohol than folks with light eyes, according to an article in the journal Personality and Individual Differences. In the study, researchers looked at two sets of archival data: one group was comprised of 10, white men (who happened to be prison inmates), and the other was made up of 1, white women who responded to a national survey. What they found was that in both samples, light-eyed folks drank much more alcohol than hazel-eyed and brown-eyed people. The reason? Lighter-eyed individuals are less sensitive to alcohol's affects, which, in turn, made them consume more of it. That also means that hazel-eyed folks are less prone to developing a physical alcohol dependence. Nothing wrong with being a little more efficient!

Blue-eyed men don't prefer women with hazel eyes

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To the ladies with hazel eyes out there currently partnered to a blue-eyed man: your relationship beat the odds — at least according to science. Blue-eyed men find blue-eyed women more attractive than they do women with any other eye color, according to a study in the journal Behavioral Ecology and Sociobiology. Blue-eyed men were the outliers too, as blue-eyed women didn't have a preference for their partner's eye color. Neither did brown-eyed and hazel-eyed men and women. Um, what exactly is going on here?

Fortunately, the researchers have a theory about why this is the case, which sheds a little light on this mystery. They believe that blue-eyed men's preference for ladies with the same phenotype is born out of potential paternal uncertainty, which is defined as having doubt of their child's true paternity. In other words, if the azure-eyed man's baby has blue eyes, he will be more convinced that it's biologically his. That's because two blue-eyed parents may be more likely to have a blue-eyed child than not, although the latter is a possibility nonetheless. 

Are hazel eyes different from eyes with heterochromia?

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Part of the reason that hazel eyes are so unique and beautiful is because they have two or more colors within the iris, which is pretty uncommon. But don't get that confused with another condition wherein the iris has different colors in it, which is called central heterochromia, according to an article in Owlcation. That's when the iris has two different colors, with one color in a ring around the pupil that's different from the rest of the iris. The pattern is similar to that of hazel eyes, but it's not the same thing.

There are other forms of heterochromia as well. For one, there's complete heterochromia, which is when the color in the iris of one eye is completely different than that of the other eye — think Alice Eve. There's also sectoral heterochromia, which is when the iris has splotches that are a different color from the rest, like the eyes of actors Dominic Sherwood and Kate Bosworth. 

All forms of heterochromia are much less common than hazel eyes and also happen in the animal kingdom in cats, dogs, and more. Fascinating!

You can be any race and have hazel eyes

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Those of the hazel-eyed persuasion don't hail from one specific ethic group or race. Rather, you can be any race or ethnicity and be lucky enough to score a set of hazel peepers, as evidenced by the many celebs who have them.

In addition to those already mentioned, which includes both white and black women, plenty of diverse men have hazel eyes. For one, Empire actor Terrence Howard has a lovely pair of hazel-colored peepers, and he's biracial, as noted by The Grio. Additionally, the super gorgeous model Daje Barbour has an exquisite set of hazel eyes, and he's African American.

As for other folks, Gilmore Girls star Jared Padalecki has some arresting hazel eyes, and he's white. OG badass Danny Trejo also has an especially lovely hazel-green eye color, and he's a proud Latino. South Korean actress Lee Sung Kyung is also in the hazel club, proving that hazel eyes are truly universal.

Blue-eyed babies can become adults with hazel eyes

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For some of us, the eye color that we present with at birth is the same that it will be for the rest of our lives, according to an article posted by McGill University. This is especially true for folks of Latinx, Asian, and African decent, as that's where brown eyes are overwhelmingly the norm, so plenty of melanin will be present in the iris at the time of a baby's birth. 

But that's not the case for everyone. For white or other less-melanated people, it's not uncommon at all for babies to be born with blue eyes that can later turn different colors, including hazel. That's because it can take a while for melanin to be deposited into the iris, which usually is completed after about six months. At that time, a baby's eyes can turn green, hazel, gray, or brown. And in some cases, it can take much longer for eye color to fully develop, sometimes into adulthood. That's just one more mystery that melanin brings to the genetic table.

Are people with hazel eyes more at risk for cancer than brown-eyed people?

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Although having light-colored eyes is considered to be quite beautiful, it can come with its own set of risks and vulnerabilities. To that end, it's important to point out that people with hazel eyes who have more melanin in their eyes are less prone to some risks than hazel-eyed folks with super light-colored eyes. It's just the luck of the draw.

Specifically, if you have light-colored eyes, you're more at risk for some kinds of cancer, according to Every Day Health, which includes light-colored eyes with a hazel pattern. That's because the lighter your eye color, the more light-sensitive your eyes are, so you need to take precautions. "People with light iris color need to be diligent in wearing UV-protected sunglasses," said Dr. Ruth Williams, an ophthalmologist at the Wheaton Eye Clinic in Chicago. "This is likely due to the sparsity of light-absorbing pigment in the eye. The more pigment you have, the less light gets through the iris." So in order to avoid getting melanoma of the uvea, protect your hazel peepers, especially if they're greener than they are brown.

Sours: https://www.thelist.com//the-truth-about-hazel-eyes/
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Central Heterochromia

What is central heterochromia?

Rather than have one distinct eye color, people with central heterochromia have a different color near the border of their pupils.

A person with this condition may have a shade of gold around the border of their pupil in the center of their iris, with the rest of their iris another color. It’s this other color that is the person’s true eye color.

Read on to learn how this condition differs from other types of heterochromia, what may cause it, and how it’s treated.

Other types of heterochromia

Central heterochromia is just one type of heterochromia, an umbrella term that refers to having different eye colors. The other types of heterochromia are complete and segmental.

Complete heterochromia

People with complete heterochromia have eyes that are completely different colors. That is, one eye may be green and their other eye brown, blue, or another color.

Segmental heterochromia

This type of heterochromia is similar to central heterochromia. But instead of affecting the area around the pupil, segmental heterochromia affects a larger portion of the iris. It can occur in one or both eyes.

What causes heterochromia

To understand possible causes of central heterochromia, and heterochromia in general, you need to look at the relationship between melanin and eye color. Melanin is a pigment that gives human skin and hair their color. A person with fair skin has less melanin than a person with dark skin.

Melanin also determines eye color. People with less pigment in their eyes have a lighter eye color than someone with more pigment. If you have heterochromia, the amount of melanin in your eyes varies. This variation causes different colors in different parts of your eye. The exact cause of this variation is unknown.

Central heterochromia often occurs sporadically at birth. It can appear in someone with no family history of heterochromia. In most cases, it’s a benign condition not caused by an eye disease, nor does it affect vision. So it doesn’t require any type of treatment or diagnosis.

Some people develop heterochromia later in life, however. This is known as acquired heterochromia, and it may occur from an underlying condition such as:

  • eye injury
  • eye inflammation
  • bleeding in the eye
  • tumors of the iris
  • Horner’s syndrome (neurological disorder that affects the eye)
  • diabetes
  • pigment dispersion syndrome (pigment released into the eye)

Diagnosing and treating heterochromia

Any change in eye color that occurs later in life should be examined by a doctor or ophthalmologist, a specialist in eye health.

Your doctor may complete a comprehensive eye examination to check for abnormalities. This includes a visual test and an examination of your pupils, peripheral vision, eye pressure, and optic nerve. Your doctor may also suggest an optical coherence tomography (OCT), which is a noninvasive imaging test that creates cross-sectional pictures of your retina.

Treatment for acquired heterochromia depends on the underlying cause of the condition. No treatment is necessary when a visual exam or imaging test doesn’t find an abnormality.

Outlook for this condition

Central heterochromia may be a rare condition, but it’s typically benign. In most cases, it doesn’t affect vision or cause any health complications. However, when central heterochromia occurs later in life, it may be a sign of an underlying condition. In this instance, seek medical attention for a possible diagnosis and treatment options.

Sours: https://www.healthline.com/health/central-heterochromia
Probability Comparison: Human Eye Colors - Rarest Eyes Colours

Central Heterochromia (Different Color Eyes)

What is Central Heterochromia?

Have you ever seen someone with fascinating eyes? Perhaps they were each two different colors or, maybe, the eyes seemed to have different colors within each iris. There is a name for this.

Heterochromia is the eye condition characterized by color differences in your iris, the colored part of your eye.(2) This may occur between the two eyes or within one eye. Central heterochromia, in particular, is characterized by differences in pigmentation in the same eyes.

Central heterochromia causes a color abnormality that looks like it stems from the pupil at the center of the eyes, like cat eyes. Due to an uneven distribution of melanin, the outer ring will almost always be blue or green. And it is common for the inner ring to be gold or hazel. So the person may appear to have hazel eyes.

Most of the time, central heterochromia happens sporadically, without any real causes for concern.(3) However, rarely, heterochromia is linked to a congenital syndrome, such as Waardenburg syndrome, Parry-Romberg syndrome, Horner's syndrome, or Sturge-Weber syndrome.(2)

Treatment is not typically necessary to treat this eye condition unless there are underlying causes behind the difference in each eye’s iris color or unless it is congenital heterochromia. Otherwise, heterochromia does not typically affect someone’s eye health or vision.

Other Types of Heterochromia

There are different types of heterochromia. One affects the same eye and the other affects both eyes:

AdobeStock

Segmental Heterochromia

Segmental heterochromia is also known as heterochromia iridum, sectoral heterochromia, or partial heterochromia. 

Again, it occurs when different areas of the same iris vary in pigment.(3) For example, someone might have blue eyes with bits of brown or brown eyes with a patch of green.

Someone with this type of heterochromia might appear to have speckled eyes. The speckle can be very interesting to see, though it is not always obvious. You may not notice segmental heterochromia from far away unless you look up close.

Complete Heterochromia

Complete heterochromia, also known as heterochromia iridis, refers to when the iris in one eye is a different color than the iris in the other eye. So someone who has totally different colored eyes might have complete heterochromia.(3)

For example, someone might have one blue eye and one brown eye. Or they might have one green eye and one blue eye. The color variation can be with any two colors.

What Determines Eye Color?

Eye color is determined by gene variations. Most genes that are linked to eye color produce, transport, or store a pigment called melanin.(4)

A typical iris consists of five layers.(1)

  1. Iris pigment epithelium (IPE)
  2. Sphincter
  3. Dilator muscles
  4. Stromal layer (SL)
  5. Anterior border layer (ABL)

The amount of melanin in the front layers of the iris causes eye color.(5) So someone with a lot of melanin might have brown eyes, while someone else with less melanin may have a lighter eye color, such as blue or green eyes.

Of course, some people wear colored contact lenses to change the look of the color of their eyes, too.

Looking in direct sunlight and wearing certain colors (especially like bright colors that accentuate your eye color) can also tend to change the appearance of the color of your eyes. For example, while wearing a blue T-shirt does not make green eyes blue, the reflection can make them appear more bluish than greenish.

How Rare is Central Heterochromia?

Heterochromia is a rare eye condition, but it’s also rarely an eye health concern. Fewer than , Americans have the condition.(6)

If you have central heterochromia, you are not alone. In fact, some famous people have heterochromia. Mila Kunis and Kate Bosworth are both believed to have it.

What Causes Central Heterochromia?

Central heterochromia is typically a benign condition that occurs because of the uneven distribution of melanin. It’s not usually caused by a medical condition or eye disease like glaucoma. And it does not usually affect vision.(3)

Central heterochromia can happen due to an eye injury or eye inflammation. You should see an ophthalmologist for an eye exam if you notice that the iris in one or both of your eyes has changed color.

How is Central Heterochromia Diagnosed?

To be diagnosed for central heterochromia, you must see a doctor who specializes in ophthalmology. This eye doctor will do a routine eye exam to look for uneven or totally different pigment dispersion in one or both eyes.

If you are diagnosed with central heterochromia, it’s typically not a cause for concern. But your eye doctor may ask you questions to find out if there is an underlying health condition that has caused your difference in eye color.

If you do have an underlying eye condition or have had an eye injury that has caused heterochromia, your eye doctor may recommend a specific course of action. You may need to see another type of doctor to treat that specific condition, which may help this particular symptom.

Treatment for Central Heterochromia

There are no treatments for central heterochromia.(3) Central heterochromia does not generally affect people’s eyesight, so treatment isn’t really necessary.

Some people may choose to wear colored contact lenses in both eyes to change the color of their eyes. Or they may wear one colored contact lens to match the color of the other eye. Contacts are just for aesthetics and personal choice.

If you do choose to wear colored contacts, talk to your eye doctor about contacts that are right for you. You will need a proper eye exam to get a contact prescription. If you do not need corrective lenses, you can still buy colored contacts that are strictly cosmetic.

Central Heterochromia Prognosis

Most people who have central heterochromia are perfectly healthy. The eye condition is not typically known to affect their eye health, general health, or vision. Therefore, people who live with central heterochromia have an excellent prognosis.

That said, it’s important to talk to your eye doctor about changes in your eye color. You always want to be sure to rule out any underlying causes, even though they tend to be rare.

6 Cited Research Articles

  1. Edwards, Melissa, et al. “Iris Pigmentation as a Quantitative Trait: Variation in Populations of European, East Asian and South Asian Ancestry and Association with Candidate Gene Polymorphisms.” Wiley Online Library, John Wiley & Sons, Ltd, 22 Dec. , onlinelibrary.wiley.com/doi//pcmr
  2. “Heterochromia Iridis.” Genetic and Rare Diseases Information Center, U.S. Department of Health and Human Services, rarediseases.info.nih.gov/diseases//heterochromia-iridis.
  3. “Heterochromia.” American Academy of Ophthalmology, 19 Apr. , www.aao.org/eye-health/diseases/what-is-heterochromia. 
  4. “Is Eye Color Determined by Genetics?: MedlinePlus Genetics.” MedlinePlus, U.S. National Library of Medicine, 18 Sept. , medlineplus.gov/genetics/understanding/traits/eyecolor/#.
  5. Rennie, I G. “Don't It Make My Blue Eyes Brown: Heterochromia and Other Abnormalities of the Iris.” Eye (London, England), Nature Publishing Group, Jan. , www.ncbi.nlm.nih.gov/pmc/articles/PMC/. 
  6. Ur Rehman, Habib. “Heterochromia.” CMAJ : Canadian Medical Association Journal = Journal De L'Association Medicale Canadienne, Canadian Medical Association, 26 Aug. , www.ncbi.nlm.nih.gov/pmc/articles/PMC/.

Melody Huang is an optometrist and freelance health writer. Through her writing, Dr. Huang enjoys educating patients on how to lead healthier and happier lives. She also has an interest in Eastern medicine practices and learning about integrative medicine. When she’s not working, Dr. Huang loves reviewing new skin care products, trying interesting food recipes, or hanging with her adopted cats.

AnnaMarie Houlis earned her B.A. in Journalism & New Media with a double minor in Creative Writing and Women, Gender & Sexuality Studies from Gettysburg College. She spent several years as an editor at the helm of New York City's lifestyle scene before transitioning into full-time freelance writing from all corners of the globe. A full-time traveler, AnnaMarie's work is inspired by her fieldwork in communities around the world and grounded in extensive, expert-backed research. Her mission is to empower readers everywhere with the knowledge and resources they need—for their eye health, included.

https://www.visioncenter.org/author/annamarie/

Sours: https://www.visioncenter.org/conditions/central-heterochromia/

Or hazel heterochromia central

Central heterochromia: Definition and causes

HomeConditions

Central heterochromia is when the inner ring of the iris &#x; the eye color closest to your pupil &#x; is a different color than the outer ring, along the edge of your iris. This trait usually involves both eyes, with two separate colors appearing in each eye instead of one. Central heterochromia is almost always harmless when you&#x;re born with it.

The visual appearance of central heterochromia comes down to a pigment called melanin &#x; the same pigment that determines the color of your skin.

When melanin is distributed differently closer to the pupils, light reflects off of it in a different way and gives the appearance of two different colors in each iris.

A common form of central heterochromia shows up as predominantly blue eyes with a smaller ring of brown in the center streaking outward. It even gave one of the world&#x;s most famous photographs a visual wow factor.

Sharbat Gula, the subject of Steve McCurry&#x;s National Geographic photo "Afghan Girl," likely had this unique trait. Look carefully and you&#x;ll notice a light sea-green color in the center of her irises that radiates toward a dark blue-green hue along the outer edges.

Central heterochromia isn&#x;t the only form of this striking genetic trait. Two other forms, complete heterochromia (two different-colored eyes) and sectoral heterochromia (patches or wedges of a second color on one or both irises), can be just as photogenic.

But beauty is in the eye of the beholder, so we&#x;ll let you decide which is the most attention-grabbing.

SEE RELATED:How eye color develops, and why it changes

Causes

The family gene pool is almost never responsible for any form of heterochromia. There is a slight chance it can get passed down from parent to child, but it&#x;s unlikely.

Instead, central heterochromia is usually a random (but harmless) genetic mutation that happens sometime during development &#x; and one that doesn&#x;t happen all that often. When multiple eye colors are present at or shortly after birth, it is known as congenital heterochromia.

Like the two other forms of this trait, central heterochromia can also be caused by an underlying medical condition, trauma or medication when it shows up later in life. This is classified as acquired heterochromia. Possible causes include:

While cases of acquired heterochromia are rare, make sure to schedule a comprehensive eye exam with an eye doctor if you notice any sudden changes in your eye color.

SEE RELATED:Heterochromia causes

How rare is central heterochromia?

Complete heterochromia is definitely rare &#x; fewer than , Americans have the condition, according to the National Institutes of Health. That&#x;s only about six out of every 10, people.

It&#x;s currently unknown how rare central heterochromia is, but we do know that it isn&#x;t quite as rare as complete heterochromia.

Much of this comes down to the fact that central heterochromia is hard to document, and, unless it&#x;s acquired later in life (causing a change in eye color), it doesn't necessarily need to be documented. There are fewer questions about it because, unlike complete and sectoral heterochromia, it doesn&#x;t seem out of the ordinary.

Having central heterochromia can actually be confused with having hazel eyes, though there are a few differences. The colors in hazel eyes can appear to change in different lighting, and they tend to blend together more as they radiate away from the pupil. With central heterochromia, each ring of color is distinct within the iris.

READ MORE:What is the rarest eye color?

Page published in September

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Sours: https://www.allaboutvision.com/conditions/rare-heterochromia/
What Your EYE COLOR REALLY Is?

17 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

But you won’t get to see the tears I cry, Behind these hazel eyes.
When Kelly Clarkson sang ‘Behind the Hazel Eyes’, every person with those godly eyes felt special. But do you know, these people (with Hazel eyes) are no less than a magical phenomenon? Hold on! If you didn’t know this up until now, we have come up with the “Facts About Hazel Eyes” that will blow your mind for sure. 

Are you not obsessed with the ‘Talking to the Moon’ one of the most trendy sounds on Instagram? The one where people open their eyes when he says, Moon. To be honest that made me fall for hazel eyes and now I am completely obsessed with it. So much so that I had to know all the interesting facts about Hazel Eyes ASAP. After reading this article, you’ll be sure that hazel eyes are the most beautiful eyes in the world. Wanna bet on it?

Out of all the world population, only 5% have Hazel Eyes, making it one of the rarest eye colors. They are pretty uncommon but can be easily found in the UK and Europe. Lucky Caucasians! Also, hazel eyes can change their color frequently and shine brighter than other eye colors. We have given all the scientific explanations below so you know you will be surprised no matter what.

Let’s start with all these unique facts and unravel what is it about the Hazel Eyes that makes them so special. Stay Tuned!

17 Fun Facts About Hazel Eyes You Never Knew About

17 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

Those eyes are simply heaven for us, who have the basic brown in their eyeballs. But don’t get too excited if you have Hazel Eyes, there are some health facts written below that might require your better attention. So Read Closely. 

1. Rarer than Blue & Brown Eyes

According to World Atlas, only 5% of the whole world population (which is close to 8 billion) have Hazel Eyes. This fact makes them rarer than Blue eyes which are only present in % of the world population. Also, rarer than brown eyes which almost 79% of the world has.

Also, Read 11 Facts about Brown Eyes Nobody Knew Before | All Research-Based Facts

2. Hazel Eyes are not the Rarest Eye Colour

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

There are grey eyes, violet eyes, purple/pink eyes, even people with Heterochromia (People with two different eye colors). So that makes those colors even rare than Hazel. WOW!

3. Mostly Middle Eastern & North African have Hazel Eyes

In the “Facts About Hazel Eyes“, did you know, Hazel eyes are more frequent in people from Brazil, Spain, and Europe. However, they are not the only ones having Hazel Eyes. North Africans have more Hazel eyes than the rest of the countries. 

Beauty in Diversity!

You cannot miss the 11 Facts About Blue Eyes That Will Stun You

4. Your Favourite Celebs Have Hazel Eyes

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

Zendaya, David Beckham, Lady Gaga, Angelina Jolie, Ryan Reynolds, all of them Hazel eyes. This might be another reason why you fell for them and never knew the reason. Until Now! Watch out for those eyes! They might Spellbind you. I am sure they got me in the first look.

5. Hazel Eyes are Often Seen in Caucasian People

If you’re a Caucasian, then you have seen Hazel Eyes pretty much all your lifetime. It is one of those Hazel Eye facts that is concluded after much research.

Caucasian people are white-skinned North Americans who have a European origin. In these people’s eyes, a combination of brown, blue, and green is seen quite often.

Also, Read 15 Amazing Facts About Green Eyes | Revealing The Unknown

6. Every Hazel Eye is Unique | The Truths Behind Hazel Eyes

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

Much like our fingerprints, the color of every Hazel Eye is different from another. Just in case you know a person with magic in its eyeballs, you can surprise them with these unique facts about Hazel Eyes. 

7. 16 Genes Contribute to Hazel Eye Colour

Do you know that 16 genes contribute to a person’s eye color? Really? 16 Genes? This means that even if your parents don’t have hazel eyes, there are still chances for you to have them.

A child can end up with Hazel Eyes without its parents having the same. Also, no one can determine the color of a child’s eyes before its birth. Wasn’t this one of those eye-opening facts about Hazel Eyes?

8. Hazel Eyes Occur Due to Rayleigh Scattering

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

The eye color of almost every person with Hazel Eyes changes during their lifetime. It is because of the same reason the sky looks blue. Dreamy, Right?

It’s Science!

That reason is Rayleigh Scattering. Because of this Phenomenon light scatters and causes eyes to look like a different color than their original one. 

9. Scientists Refer to Hazel Eyes as the ‘Eye Colour Chameleon’

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

This one from the ‘Facts about Hazel Eyes‘ might seem a little funny to you. As Hazel is not an actual color it is a blend of blue-green, yellow, and brown, it is difficult to describe every shade of the Hazel Eyes.

That’s why scientists refer to Hazel Eyes to the Eye Colour Chameleon because Chameleon also doesn’t have one true color. 

Hazel Eyes Have Moderate Amount Of Melanin 

The amount of Melanin Hazel Eyes have is more than blue eyes but less than brown eyes. Melanin is the key skin color pigment that makes us have the skin tone that we have, dark, black, brown, white, and many more. 

Also, read 17 Interesting Facts About Grey Eyes Along with Superstitions and Common Beliefs

Isn’t it one of the most amazing Hazel eye facts?

Hazel Eyes Can Change its Colour in Babies

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

This fact is pretty surprising as it is not very well known for human eyes to change their color, which leads us to our question.

Why do hazel eyes change color?

Babies that are born with blue eyes or green eyes can have Hazel eyes when they grow up. This happens because Melanin takes time to deposit in the human eyes. The time eyes take to have their original color can be from two months of birth to up to three years. So, Melanin is the reason due to which Hazel Eyes change their color.

Hazel Eyes can Change its Colour even in seconds

You might not have been expecting this one from Facts about Hazel Eyes. Many people have a gradient of colors in their Hazel eyes. In that case, as more or less light falls upon the eyes, the pupil can either get smaller or bigger. Depending on that, the colored part can get compressed or can spread making it look like the Hazel eye changed its color. When it is only science. 

Hazel Eyes Shine Brighter than Other Eyes

It has been found after research that hazel eyes reflect more light than other eye colors like Brown or Black eyes. Hazel eyes can reflect the green color of trees or the sunlight shine more than other colors, which makes them shine more than other eye colors. It is one of the most awesome facts about Hazel Eyes.

Hazel Eyes Are Vulnerable to Sun’s Rays

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

Since you know that hazel eyes have less Melanin than Brown/Black eyes. This means hazel eyes are more vulnerable to the harmful rays of the sun because Melanin protects our body from certain types of Cancers. This one from the hazel eye facts aware you wear shades every time you go out in the sun, exposed to UV rays. 

Hazel Eyes are Prone to Macular Degeneration

The light-sensing cells in the Hazel eyes get damaged easily in the early 50s or 60s making hazel eyes vulnerable to Macular Degeneration. The central vision is impaired in such a condition which can lead to a total loss of vision.

People Confuse Hazel Eyes With Central Heterochromia

Central Heterochromia is a phenomenon when the inner ring of the iris is different of a different color than the outer ring. People usually think that hazel eyes are caused due to central heterochromia and we choose to differ. We have facts for it. Don’t believe me?

17 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

Hazel Eyes are not caused because of central heterochromia. As I already told you hazel eyes are caused because of Rayleigh Scattering, and another phenomenon is far from it. This was another one of the facts about hazel eyes.

75% of Hazel Eyes Have A Brown Ring

Do you know why hazel eyes look so majestic? Because they have a brown ring around them. Yes!Research has shown that around 75% of hazel eyes have a brown ring, making them totally unique.

15 Shocking Facts About Hazel Eyes I Bet You Never Knew Before

It is very strange that no eyes of other colors, such as blue, green or grey have a brown ring around them. It is only hazel eyes that have been gifted with it.

Wrapping Up

To be true, I never knew before that hazel eyes are so rare that only 40 Million from this whole ~8 Billion World have hazel eyes. That’s as crazy as it is shocking. Hope you guys liked this article on “Facts about Hazel Eyes.” 

Share this article with your friends who have hazel eyes and let them know what you think about them. Comment below your favorite fact about Hazel Eyes.

Have a Great Day!

Frequently Asked Questions

What are the myths about Hazel Eyes?

1. People that have Hazel eyes are smarter.
2. Women with Hazel Eyes are sexier than other women.
3. They are better lovers.
4. Hazed-eyed people highly believe in spirituality.
5. They are more mischievous.

What are the makeup tips for Hazel Eyes?

1. Do not experiment with blue-grey eye shadows.
2. You can experiment with colorful eyeliners, although black also looks good on Hazel Eyed People.
3. Combination of Beige and Caramel eyeshadows create a beautiful effect on Hazel Eyes.
4. Gold looks best on Hazel Eyes so make sure you use that in one way or another.
5. Always curl your eyelashes to attract more attention to your eyes.

Name some celebrities With Hazel Eyes

Kelly Clarkson, Britney Spears, Tyra Banks, Emma Roberts, Nikki Reed, Rachel Mcadams, David Beckham, Jennifer Lopez, Jason Statham, Heidi Klum, Zendaya, Tami Roman and the list goes on.

What is special about hazel eyes?

Hazel eyes are more reflective and shiny than any other eye color. that’s why it also appears sometimes that Hazel eyes have changed their color.

How rare are hazel eyes?

Although Green eyes are rarer than Hazel eyes, still there are only 5% of people with Hazel eyes. The combination of colors in Hazel eyes comes after genetic mutations and more than 16 genes affect the color of a person’s eyes.

Are Hazel Eyes attractive?

Yes, if you have Hazel eyes then you are times more likely to land in the hottest list of women and 3 times for men.

Are Hazel Eyes Common?

No, Hazel Eyes are pretty rare, because only 5% of the whole world population has them. If you do have these magical eyes, consider yourself very rare and lucky.

What is the rarest eye color for redheads?

Blue Eyes in red-haired people is the rarest combination that is seen in redheads.

Sours: https://pathofex.com/facts-about-hazel-eyes/

Similar news:

Hazel Eyes vs Central Heterochromia Learn The Differences

Hazel Eyes vs. Central Heterochromia

 

Have you ever met someone with two different eye colors in the same eye? Have you always considered them as having hazel eyes? That could be the case, but it could be something more. Let’s take a look at the differences between hazel eyes vs. central heterochromia, a term you may have never heard of.

Causes of Hazel Eyes

 

Are your eyes hazel? How do you describe them? Some say they are brownish-green or a little gold. Others might say your eyes have an amber hue to them. It may be hard to describe the actual color of hazel eyes because it seems like they are constantly changing depending on your setting. 

Science used to say that our eye color was simply something we inherit from our parents. Although this is true, it doesn’t necessarily mean we will have their same eye color. Up to 16 genes can play a part in our eye color, and it all depends on how those genes interact with each other. 

Melanin is the pigment that gives us our eye color and also affects our skin color. Those that have a fair amount of melanin tend to have hazel eyes. If even more melanin is present (like in African Americans, Hispanic or Asian populations), their eyes lean more towards a dark brown color. 

Babies born with blue eyes can develop more melanin in their bodies as they grow, resulting in changing eye color as older children. There is actually no such thing as blue, green, or hazel pigments in the eye. It’s all just different levels of the brown pigment called melanin.

Causes of Central Heterochromia

 

When you meet someone with two different eye colors in the same eye, you can’t help but stare. It’s beautiful! This trait is called central heterochromia and is very rare. You may have never heard of it, but it’s when the inner ring of the iris (the colored part of your eye next to the pupil) is an entirely different color from the outer ring of the iris. Usually, this happens in both eyes. 

Just like hazel eyes, or any eye color for that matter, central heterochromia is caused by melanin being dispersed differently throughout your iris. Other forms of central heterochromia can also appear as different colored wedges in the eye or even as both eyes being different colors from each other.

Central heterochromia isn’t usually genetic but appears randomly. This condition is not usually something to be concerned about. But if it shows up later in life, you may want to get it checked out as it can be a sign of injury, infection, diabetes, or other medical condition.

What Are Their Differences?

 

In short, the difference between hazel eyes and those with central heterochromia lies in how the melanin is dispersed. Hazel eyes can appear to be two different colors, but they blend together at some point, where central heterochromia has two very distinct rings of color within the iris.

Learn more about your eyes and healthy vision habits by calling us to schedule an eye exam today.

Sours: https://vision-boutique.com/hazel-eyes-vs-central-heterochromia/


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