Blue Eyes and Your Health (2022)

Your genes determine whether you have blue eyes. If you inherit blue-eye genes from your parents, it means that your eyes will have less of a pigment called melanin in them. This doesn't just make them look blue—it can also make you at higher risk for develop certain health problems compared to people with other eye colors.

This article discusses where blue eyes come from and how having blue eyes may increase your risk for certain health conditions.

Blue Eyes and Your Health (1)

What Is the Iris of Your Eye?

Why Some Eyes Are Blue

The iris is the colored part of your eye that has multiple layers. The top layer, called the epithelium, is where the melanin (pigment) that gives an eye its color lives.

Blue eyes lack melanin in the iris. The blue hue comes not from pigment, but from the light reflecting on the water in the eye and through layers below. So, at least from a biological standpoint, blue eyes are actually colorless.

Will Your Baby Always Have Blue Eyes?

Genetics of Blue Eyes

Both parents have to pass along the blue eye gene in order for their child to have blue eyes. That doesn't necessary mean that the parents themselves have to have blue eyes; it's possible they carry the gene, but it is recessive. However, a blue-eyed child is almost certain if both parents have blue eyes.

Blue eyes actually didn't exist 10,000 years ago. Researchers believe there is one ancestor responsible for blue eyes that descended from the Black Sea region of southeastern Europe anywhere between 6,000 to 10,000 years ago.

This one person with a genetic mutation had children, and the trait was passed to the next generation. As that generation had children and moved around, the blue eye mutation continued to spread across many parts of the globe.

This means everyone with blue eyes has one thing in common—they're all related. Blue eyes may have developed due an evolutionary response to the dark winters prevalent in Northern Europe. In theory, blue eyes may protect a person from acquiring vision disorders caused by these periods.

Why Do a Baby's Blue Eyes Sometimes Change?

It may take up to six months for the gene responsible for creating the pigment in the eyes to activate melanin production. A baby's eyes may be blue during this time, but later change color. If this gene activation never happens, a baby's eyes will stay blue.

How Your Genes Determine Eye Color

(Video) The Truth About Blue Eyes

Impact on Your Health

Eye color is about more than appearance. Studies have shown that having blue eyes can be a starting point for figuring out why people develop certain health conditions.

For example, researchers are looking at the connection between having blue eyes and:

  • Eye cancer
  • Diabetes
  • Macular degeneration
  • Hearing loss

Can You Have One Blue Eye and One Brown Eye?

Blue Eyes and Eye Cancer

Eye health providers remind almost everyone with blue eyes to wear sunglasses to reduce their risk of potential eye cancers like eye melanoma. In the same way, you can get melanoma on your skin, you can also get melanoma in your eye.

Eye melanoma is known to be more common for those with fair skin and light-colored eyes. While ocular melanomas may happen at any age, the risk goes up as you get older.

Does Eye Color Affect Your Cancer Risk?

Blue Eyes and Type 1 Diabetes

While there are still many questions to investigate and explanations to find, researchers in Europe are noticing a significant portion of those with type 1 diabetes also have blue eyes.

Does Diabetes Affect Your Eyes?

Blue Eyes and Macular Degeneration

The macula, which is at the retina's center, is susceptible to damage as you age. This damage will cause your vision to become blurrier and more distorted—a condition called macular degeneration.

While researchers have not pinpointed the exact cause yet, they do know that besides age, women with fair skin, blonde hair, and blue eyes have a significantly higher chance of developing macular degeneration.

Are Blue-Eyed People More Likely to Get Macular Degeneration?

Blue Eyes and Hearing Loss

Scientists are looking into the possibility of those who have blue eyes being at higher risk for sensorineural hearing loss.

This form of hearing loss comes from damage to the inner ear or to the nerve going from the ear to the brain. Since the inner ear uses melanin, and blue eyes come from a lack of melanin, some researchers hypothesize there may be a link between eye color and acquired hearing loss.

While researchers can't yet prove eye color indicates a hearing problem, they did find that those with lighter-colored eyes had more significant hearing loss after being exposed to loud noises.

(Video) Eyes: The Windows to Your Health | National Geographic

Waardenburg Syndrome: Pale Blue Eyes, Hearing Loss, and More


Blue eyes come from genetics. While you get the gene for blue eyes from your parents, everyone with blue eyes is related to the same ancestor from thousands of years ago.

If you have blue eyes, it means the iris part of your eyes lacks melanin. Technically, blue eyes don't have any color. They look blue because of how light is reflected.

Having blue eyes might increase your risk of certain health problems like type 1 diabetes and eye cancer. That's why it's important that you have regular eye exams and protect your eyes (for example, by wearing sunglasses).

How to Protect Your Eyes

Frequently Asked Questions

  • How does a parent with a different eye color have a blue-eyed child?

    There are two main genes on chromosome 15 that determine a person's eye color: OCA2 and HERC2. Blue eye color is a recessive trait, but brown-eyed parents can still produce a blue-eyed child if both parents carry the genes for blue eyes.

    Learn More:Are Blue Eyes the Rarest Eye Color?

  • Why do some people have light blue eyes and others have dark blue?

    Eye color is partially affected by light, especially blue eyes, which get their color specifically by light entering and reflecting out of the eye. This can make the blue eyes look slightly different depending on the type of lighting conditions.

    (Video) Velvet Underground - Pale Blue Eyes

  • How rare are blue eyes?

    Only about 8 % to 10% of the world population has blue eyes. To put that in perspective, 79% of people have brown eyes.

  • Which country has the most people with blue eyes?

    Blue eyes are more concentrated in certain regions than others. Estonia is the country most known for its fair-skinned, blue-eyed population, followed closely by Finland. Ireland and Scotland have the next-highest population of people with blue eyes.

What Is the Most Common Eye Color?

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(Video) Blue eyes aren't actually blue

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8 Sources

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.

  1. American Academy of Ophthalmology. Your blue eyes aren’t really blue.

  2. MedlinePlus. Is eye color determined by genetics?

  3. American Cancer Society. Risk factors for eye cancer.

  4. Di Stasio E, Maggi D, Berardesca E, et al. Blue eyes as a risk factor for type 1 diabetes. Diabetes Metab Res Rev. 2011;27(6):609-613. doi:10.1002/dmrr.1214

  5. Mujica-Mota MA, Schermbrucker J, Daniel SJ. Eye color as a risk factor for acquired sensorineural hearing loss: A review.Hearing Research. doi:10.1016/j.heares.2014.12.002

  6. Donnelly MP, Paschou P, Grigorenko E, et al.A global view of the OCA2-HERC2 region and pigmentation.Hum Genet.2012;131(5):683-96. doi:10.1007/s00439-011-1110-x

  7. WorldAtlas. Countries with the most blue-eyed people.

  8. WorldAtlas. Countries with the most blue-eyed people.

    (Video) Sunlight: Optimize Health and Immunity (Light Therapy and Melatonin)


What your eye color says about your health? ›

Lighter-colored eyes may mean an increased risk for cancer. Because lighter eyes have less pigment to protect them from harmful ultraviolet rays, it's true that light-eyed people have a greater lifetime risk for melanoma of the uvea, the middle layer of the eye, than their dark-eyed peers.

What is special about blue eyes? ›

Blue Eyes are More Sensitive to Light

Melanin in the iris of the eye appears to help protect the back of the eye from damage caused by UV radiation and high-energy visible “blue” light from sunlight and artificial sources of these rays.

Are blue eyes less healthy? ›

Having blue eyes might increase your risk of certain health problems like type 1 diabetes and eye cancer. That's why it's important that you have regular eye exams and protect your eyes (for example, by wearing sunglasses).

What does your eyes says about your health? ›

Eyes aren't just the window to your soul — they also offer a glimpse into your health. Changes in your eyes can signal vision problems, diabetes, stress, even retinal detachment. What's more, most of these you can actually see for yourself — assuming you know what to look for.

This article discusses where blue eyes come from and how having blue eyes may increase your risk for certain health conditions.. Both parents have to pass along the blue eye gene in order for their child to have blue eyes.. Eye health providers remind almost everyone with blue eyes to wear sunglasses to reduce their risk of potential eye cancers like eye melanoma .. Eye melanoma is known to be more common for those with fair skin and light-colored eyes.. Since the inner ear uses melanin, and blue eyes come from a lack of melanin, some researchers hypothesize there may be a link between eye color and acquired hearing loss.. Blue eyes come from genetics.. While you get the gene for blue eyes from your parents, everyone with blue eyes is related to the same ancestor from thousands of years ago.. If you have blue eyes, it means the iris part of your eyes lacks melanin.. Having blue eyes might increase your risk of certain health problems like type 1 diabetes and eye cancer.. Blue eye color is a recessive trait, but brown-eyed parents can still produce a blue-eyed child if both parents carry the genes for blue eyes.. Eye color is partially affected by light, especially blue eyes, which get their color specifically by light entering and reflecting out of the eye.

One of the rarer kinds of eye color out there are blue eyes.. With less then 10% of the population in the world having blue eyes, blue eyes are considered among the most beautiful eye colors out there.. Because blue eye color is associated with western culture, and many cultures place emphasis on this culture, blue eyes are seen as a benefit and something sought after.. Bright Colors make Eyes Appear More Blue The intensity of blue eyes change depending on what people wear.. People With Blue Eyes End Up Having Red Eye In Photos Red eye in photos can be annoying and time consuming to fix with photo editing software.. Individuals With Blue Eyes Are More Sensitive To Light Individuals with blue eyes often report having increased sensitivity to light.. Figuring Out The Mechanics Behind Passing On Blue Eye Color Is A Challenge A great deal of modern research has helped to shift how we consider blue eye color.. While it may be more challenging, it is still possible for people with any eye color to have the reported benefits associated with blue eyes, just like it is possible for any eye color to suffer from the cons of having blue eyes.

You may have heard that if you have blue eyes, you’re at a higher risk of developing eye diseases.. The research shows that there is less pigment in blue eyes, and green eyes for that matter, than there is in brown eyes.. There is a bit of research that mentions that blue-eyed people are more susceptible to developing eye melanoma , which is cancer of the eyes.. If you have blue eyes or other light-colored eyes, you can take comfort in the fact that eye melanoma is a rare form of cancer that occurs in only about six out of one million people .. If you smoke, you are further increasing your risk for developing eye diseases, as well as many other diseases not related to your eyes.

A person with Grave’s disease may feel pressure or pain within the eyes, light sensitivity, loss of vision, redden and inflamed eyes, and a gritty sensation in the eyes.. Some symptoms of uveitis are loss of vision, blurred vision, floating spots in your field of vision, light sensitivity, and eye pain.. This is referred to as optic neuritis , which can cause foggy vision, eye pain, and loss of vision.. If you experience any of these symptoms, your doctor likely will send you to a neurologist and an eye specialist to get a full view of what’s going on behind the eyes and in the brain.. Yellow eyes are a symptom of jaundice, a disease of the liver, and red eyes indicate a burst blood vessel or irritated eye.

Other eye symptoms associated with Graves' disease include a gritty sensation in the eyes, pressure or pain in the eyes, puffy or retracted eyelids, reddened or inflamed eyes, light sensitivity, double vision, or even vision loss.. While some symptoms that affect your eyes and your health are visible to you when you look in the mirror, others can only be seen by an eye doctor.. Don't assume that your eye doctor is there only to help determine the right set of eye glasses or contacts.. "Diabetic retinopahy affects blood vessels in the light-sensitive tissue called the retina that lines the back of the eye," the National Eye Institute notes on its website .. But the lesson from this look at your eyes and what they can tell you about your health is the importance of regular eye examinations.

Blueberries may be small, but they also pack 2.4 grams of fiber per 100-gram serving, or about 10% of the daily recommended intake.. Good to know: Wild, lowbush blueberries provide more antioxidants than cultivated highbush blueberries.. Other studies found a similar effect on postmenopausal women.. Last but not least, these delicious little fruits are good for the gut too.. But there are many different ways you can use them whether they’re fresh, frozen, or dried.. Make a blueberry topping for vanilla ice cream by cooking them with water and sugar—you can also use this topping for other desserts.. While you may enjoy a bit of a harvest in the first year, the plant will need several years to produce mature harvests.. Make sure to pick a potting mix fit for plants that love acid soil.. Remember: you’re more likely to enjoy their health benefits if you eat them regularly.

Those with more melanin tend to have brown eyes, also known as the most common eye color.. Blue eyes, like the sky and the water, get their color by scattering light, which makes more blue light reflected back out.. The colored part of the eye or iris has two layers: The innermost layer (the pigment epithelium) contains brown pigment for almost everyone, and even people with blue eyes have a brown interior layer.. The next time you (with blue eyes) see someone with blue eyes, take into consideration the fact that he/she has the same ancestor as you did thousands of years ago, even if both of you are not related in any way today.. The lighter irises due to the lack of melanin in blue eyes enable more lights to pass through, so individuals with blue eyes are better at seeing at night compared to people with darker irises.. As explained earlier, the amount of melanin pigment (which is brown in color) in the eye is the most important determinant in the coloring of your eyes.. Brown eyes have more melanin, and blue eyes have less melanin.. Blue eyes contain less melanin than hazel, green, or brown eyes, and therefore are more prone to photophobia.. Because of this, your eyes need to be protected from the sun’s UV radiation if you have blue eyes.. Interestingly, the survey has shown that most men with blue eyes prefer women with blue eyes!. While blue eyes are not very common, they are one of the most frequent eye colors at birth.. Since the human eye does not fully develop its ability to produce melanin at birth, a large number of Caucasian babies are born with blue eyes.. Consequently, eye doctors often recommend that patients with blue eyes pay more attention to their exposure to light.. Chronic exposure to UV light and blue light damages your eyes, so wearing dark sunglasses or photochromic lenses from a young age may begin protecting your eyes from damage.

Human beings have genes, but so do dogs; they have a gene that makes the eyes adapt to the blue color, which is known as the merle gene.. Merle Gene There are specific breeds of dogs that generally have blue eyes due to their genetic nature.. Also, blue eyes can be caused by another gene that is not common, which will make one eye or both to be blue.. If you have the above dogs, it’s important to note that they are carriers of the Merle gene and because of this gene the dog’s eyes can turn out to be blue, so you should not get worried seeing your dog having blue eyes.. For example, when you have two dogs with the merle gene and they breed together, the puppy will be at greater risk of having health issues and, thus, the appearance of blue eyes.. All you need to do is to be very careful when breeding the dogs with the Merle gene so that you avoid having problems arising.. In other cases, two different colored eyes are a result of other health issues such as cataracts and glaucoma.. If you happen to see your dog having two different colored eyes, this should be something to worry about because it indicates that the dog has some underlying health issues.. By any chance, if you notice that your dog’s eyes are turning blue from its natural brown color then know that the dog has certain underlying conditions.. Glaucoma A severe eye condition that may cause blindness if not treated by a vet.. A few breeds have a specific gene that causes blue eyes.. As much as you want a beautiful dog, you have to consider other traits like temperament and in this case, the most important is health concerns.. Blue-eyed dogs are common, and some occur in different breeds naturally.. Genetics is one of the main reasons dogs get blue eyes, and you need to be careful while breeding to avoid having a recessive gene that may cause severe and avoidable health issues.

Interestingly enough, studies show that men with blue eyes are very attracted to women who share their eye color.. Genetically speaking, blue-eyed people have less melanin than people with darker colored eyes, which also means that blue eyes are more sensitive to light.. Studies have shown that a majority of people with blue eyes are better at matters involving strategic thinkers than people with dark colored eyes.. Again, nobody really knows why this is, but that it definitely has something to do with the genes that determine a person’s eye color to begin with.. Another quite interesting study has shown that up to 20% of all people have a natural predisposition to distrust blue-eyed people.. In 1987, a group of researchers studying the effects of eye color and motor performance on physical education activities concluded that children with blue eyes have slower reflexes on average than children with brown eyes.. What we do know is that people with blue eyes are generally considered more attractive than people with dark colored eyes.. Many studies have been performed and they all concluded the same thing – that a majority of all people consider those with blue eyes to be slightly more attractive on average than people with brown or hazel eyes.. Italian researchers have found recently that blue-eyed people are 12% more likely to develop diabetes throughout their lives than people with dark colored eyes.. It appears that the very same genes who determine a person’s eye color also determine how resistant they are to diabetes and a couple of other chronic diseases.. Before that, a majority of all people had brown eyes whereas only a few displayed light colored eyes.. Furthermore, it is believed that blue eyes originated from a single mutation that occurred somewhere near the Black Sea.. What most people don’t know is that melanin deficiency also accelerates the development of skin cancer, a type of cancer that mostly affects people with light skin and blue eyes.

Where do blue eyes come from?Deep blue eyes Many people want to know where blue eyes come from.. Most people mistakenly believe that colors like blue and green are in the iris – but in truth they are not.. The new research suggests that as many as 16 genes may influence the way color is expressed in the iris.. People with blue, green or brown eyes all experience change in color from time to time.. Other factors can influence the shade of green in eyes.. Lighting: Artificial lighting (aka: light bulbs) can impact how eye color is experienced.. Because of this, it makes sense that a number of myths exist about people with blue eyes.

In fact, it is hard to find someone who doesn’t admire blue eyes.. Around 8-10% of the people in the world have blue eyes, coming next only to the most common eye color, which is brown.. Does the color of the eyes have anything to say about one’s personality?. The blue color you see is a result of the lighting condition, just like you see it on the big beautiful sky.. Brown and blue are not the only eye colors.. This is because people find your eyes attractive and your personality joyful.. Blue-eyed people are very smart.

Typically, people with blue eyes are likely to be more sensitive to light .. According to recent studies, people with blue eyes have a common ancestor .. Interestingly, the same studies also show that people with blue eyes have very little variation in the amount of melanin pigment.. Research shows that individuals with blue eyes may be at a higher risk of becoming alcohol dependent .. The color of a baby’s eyes can change due to increased melanin production, causing the color of the eye to become hazel, green, or brown.. While the old model of genetics believed that blue eyes could only be inherited from two blue-eyed parents, genetic models have evolved.

Visible light tends to run between 400 and 780 nanometers, and blue light ranges from 400 to 500 nanometers.. Fluorescent light LED lighting CFL (compact fluorescent light) bulbs Flat screen LED TVs All our digital devices: smartphones, tablets, and computer monitors.. However, because of the close proximity of the screen to your eyes and the length of time spent looking at them, we are gradually being exposed to more and more blue light for longer periods of time.. Short-term overexposure to blue light is associated with eye fatigue, blurred vision, burning eyes, headaches and sleep disorders.. These clearer structures absorb less blue light and allow a lot more blue and ultraviolet light to reach the back of the eye.. Blue light glasses can be useful at night when blue light from screens can disrupt natural sleep patterns.

Those moments when you stare directly at me make me want to look at those orbs.. Your pools are like the ocean, staring straight at my own, making me forget the whole world.. Those blue eyes made me realize that I have a lot more things I can do right now.. The sky cannot even compare to those pair of circles in her face; it was that true in colour.. I can only wish that I get to stare at your orbs one day, and you realize that you love me too.. It was a fantastic experience, starting straight at those blue eyes of yours filled with love.. For a moment, I cannot think of anything but the way his pools make me want to be sucked in.. Indeed, I love staring into them.. When she locks her blue eyes on you, you will stand still, wondering what she is going to do.. You seem to focus on me, zoom in if you can and make me feel the beautiful things you do.. One day you will stare at deep blue eyes and realize how it all makes the difference, believe it.

But did you know eye problems can also be the first sign of health problems?. Our eyes are a useful check for some health conditions.. Blurred vision, poor night vision Diabetic retinopathy is when tiny blood vessels in the retina at the back of the eye leak blood and other fluids, causing problems with vision.. It’s important for people with diabetes to have good control of their blood glucose.. Keeping blood pressure and cholesterol under control will help, as it does with other aspects of diabetes, so a healthy diet is key.. However, if you’re under 40, it could be a sign of dangerously high cholesterol, which is a symptom of familial hyperlipidaemia, an inherited genetic condition causing high cholesterol and high triglycerides.. If you have this symptom and you’re under 40, it’s important to get a blood test to check your cholesterol levels.. Yellowing of the eyes is known as jaundice and can be a sign of serious liver disease.. Jaundice is a sign of high levels of bilirubin, which the liver makes when it’s inflamed or damaged.. If you have this symptom, it’s important to get checked out.. Other visual symptoms of TIAs include loss of part of the vision in both eyes or double vision.. If the night blindness is related to vitamin A deficiency, supplements would be prescribed.. Iridology is an alternative health practice, in which a practitioner looks at the iris of the eye todiagnose health conditions.

Those are just a few of the utterly ubiquitous amounts of songs out there about blue eyes, usually about someone yearning or pining for a lover with eyes the color of the sky.. Even though blue eyes appear to be, well, blue, they're actually not blue at all.. According to the American Academy of Ophthalmology , blue eyes look blue for the same reason that both the ocean and the sky appear to be blue: it's simply a trick of the light.. Although there are a ton of actors, models, and other celebs who have blue eyes, which can make these colored eyes seem like a common asset (at least on television), not all that many people are lucky enough to boast baby blues.. Specifically, 79 percent of human beings have eyes the color of coffee and chocolate, dwarfing every other eye color as the dominant phenotype.. Although the odds of having blue eyes are markedly lower than having brown eyes, blue isn't the rarest of all eye colors.. But it turns out that having hazel eyes is less common than having either blue or brown eyes, as only 5 percent of people have that color in their irises.. The most rare eye colors in the world are gray eyes, red/violet eyes (which are often in people with severe forms of albinism), and eyes with heterochromia (different colored eyes), all clocking in at less than one percent of all people worldwide.. Belgium and France clock in at seventh and eighth on the list, with 28.9 percent of people in the former having blue eyes and 20.2 percent having blue eyes in the latter.. Plenty of people have blue eyes today, and there have been people with blue eyes for thousands of years.. Not only did the team at the university identify the mutation that created blue eyes, but they also discovered that everyone with blue eyes has something in common.. There's a reason blue eyes appear to change color, which is related to why they look blue in the first place.. Additionally, the color of the eye can look different depending on the color of clothing that a person wears, as well as the color and style of makeup that's applied around the eye.. But after a certain period, the genetics kick in and melanin production either ramps up, changing the color of the baby's eye, or doesn't, rendering the color of the iris blue for life.. "Because of the lack of pigment in lighter color eyes — like blue or green eyes as opposed to brown — you get a lot more unwanted light and that can create glare problems," he shared in an article in ESPN .

There aren’t just two genes — one for blue eyes and one for darker eyes as many scientists previously thought — but rather, there are up to 12 to 13 gene variations that can decide color.. These genes linked to eye color are often at play in your body in different ways, which is why eye color can be a determinant of other health aspects.. Our skin, hair, and eyes all get their color from a group of natural pigments called melanins.. In 2008, scientists discovered that everyone who has blue eyes is genetically linked to the same common ancestor , a person who experienced a genetic mutation sometime between 6,000 and 10,000 years ago.. In short, this “switch” limited the OCA2 gene from producing melanin, which led to blue color in eyes.. In the past, researchers have found that people with light-colored eyes were more likely to abuse alcohol than people with dark-colored eyes because they could handle larger amounts of alcohol.. A study conducted in Australia found that people with lighter eyes could be less “agreeable,” and far more competitive, than people with darker eyes.. After examining 336 participants, researchers from two different universities in Australia found that people with darker eyes were more “agreeable” than North Europeans with blue eyes, though the same association didn’t hold true for Europeans in general.. Could it be possible that people with brown eyes are more trustworthy than people with blue eyes?. In addition, some studies have linked specific eye colors to diseases like diabetes, melanoma, and vitiligo.. So, not only are your eyes your own personal window to the visuals and colors of the world, but they're a way for your body to tell a story of your own.

Eye color comes from pigmentation in the iris —a muscular tissue that controls the size of your pupil and allows light inside your eye.. This article explains why brown is the most common eye color and how certain eye colors are more common in different groups of people.. Even people with blue or green eyes have some melanin in their eyes.. People with brown eyes have melanin in both layers of the iris, whereas people with lighter-colored eyes have melanin in the back layer only.. Brown eyes: 45% Blue eyes: 27% Hazel eyes: 18% Green eyes: 9% Other eye colors: 1%. Though rare, people can have red or pink eyes or even two different colored eyes.. People who have albinism may not have any pigment in their eyes, so their eye color may be red or pink.. Research shows that you cannot predict a baby's eye color based only on the parents' eye colors because many genes are involved.. Researchers believe that brown eyes are the most common because our first human ancestors had this eye color.. If you are concerned about your eye color or the overall health of your eyes, talk to your eye doctor and get an eye exam.. This can cause a shift in how eye pigments are dispersed, which can make your eyes look as if they changed color.

Your veins and vein valves are the ones that work tirelessly to bring the blood back to your heart when your arteries distribute it all over your body.. But since human blood is red, how come the veins are blue?. So, if your skin is pale, your veins are likely to look blue.. Your veins appear blue because light has to enter your skin to illuminate them.. But why is it that only the veins appear blue?. But is it normal to have blue veins bulging out through the surface of your skin?. As mentioned above, it is normal to have blue veins bulging out through the surface of your skin.. This could mean that you have varicose veins, which are a common symptom of poor vein health .. • Deep vein thrombosis: this is a blood clot that forms deep inside the affected vein.. Medical experts claim that varicose veins are mainly caused by frail vein walls and valves.. Research suggests that women are more susceptible to varicose veins than men, especially since their hormones are likely to make their vein walls relax, causing their valves to leak and allow blood to flow backward.. If your occupation involves standing for a long period, then you are more susceptible to developing varicose veins, especially because standing for long periods prevents blood from flowing freely in your legs.. The extra blood puts a strain on your veins, increasing the risk of stretched vein walls and weak valves.. Since varicose veins put you at the risk of developing blood clots, you should have them checked by your medical doctor.. The most effective treatment for blue veins depends on the size of the veins, the complexity of their branches, and the presence of a blood clot.

Blue eyes are often seen in horses with white markings or dilution coat colors such as cremellos, perlinos, palominos, or buckskins.. The cream gene responsible for these coat colors also makes the eyes less pigmented.. While blue eyes are more common in some breeds, they can appear in virtually any horse breed.. As blue eyes in horses are closely linked with coat color, they most often occur in breeds displaying these white or cream type coat colors.. The chances of this happening are even higher in horses with frame overo, splashed white, or sabino patterns.. There hasn’t been a study to estimate what percentage of the horse population has blue eyes, but they are more common in certain breeds.. Since many blue-eyed horses have unpigmented skin surrounding their eyes, SCC is often associated with this group.. Blue-eyed horses don’t see any differently to dark-eyed horses, they both have the same two-color (dichromatic) vision Heterochromia is common in Paint Horses and causes the horse to have mismatched eyes Two rare conditions where a single eye has two different colors are called segmental and central heterochromia The Blue-Eyed Horse Association (BEHA) registers horses with blue eyes regardless of breed and is committed to the study of these unique animals Horses with champagne coat colors will have greenish-blue eyes at birth that will darken as they grow The blue eyes of cream-colored horses are paler than those of horses with white markings. Blue eyes in horses and other animals are caused by a reduced number of pigments in the iris.. A recent paper published in 2019 has revealed a genetic link between the splashed white coat pattern, blue eyes and increased risk of deafness in this breed.. The only structure that’s more sensitive to light in blue-eyed horses is any unpigmented skin around the eyes.


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