The Different Types of Eye Colors, Geographical and Demographical Distribution
- What Determine The Type of Eye Color?
- How do I change the Color of My Eyes?
- Why Do Different Eye Colors Change as Someone Grows?
- How to Determine your Eye Color – Know the Type of Eye Color
- The Different Human Eyes Colors
- 1. Amber Eye Color
- 2. Blue Eye Color
- Blue Eye color,Geographical and Demographical Distribution
- 3. Brown Eyes
- 4. Grey Eye Colors Types
- Grey Eye Colors Types, Geographical and Demographical Distribution
- 5.Green Eye Color
- Green Types of Eye Colors, Geographical and Demographical Distribution
- 7. Hazel Eyes
- Red and Violet Eyes
The Different Types of Eye Colors, Geographical and Demographical Distribution article is very thrilling. People have different types of eye color, many mythical rumor mills are giving funny explanation that are vague. This article is has accredited information on human type of eye colors, their geographical distribution and how you can determine your type of eye color.
What Determine The Type of Eye Color?
The Different Types of Eye Colors, Geographical and Demographical Distribution is a very thrilling article which tries to account for the different types of eyes colors that people have, how they are distributed and their populations. Before we go on to the different types of eye colors we need to get a basic introduction. So what determines the color of eyes that someone has? The type of eye color you have is determined by two main factors:
- Your iris pigmentation and
- Scattering effect of light by the stroma, a turbid medium in the iris
- Generally, for all human beings irrespective of the types of eye color, the iris pigmentation varies from black color to light brown. This pigmentation is controlled by the amount of melanin that is found in the epithelium - which is normally found behind the iris- the concentration of melanin in the iris stroma, which is normally found in front of the iris – and cells density of stroma.
Other types of eye colors such as blue, green, hazel are as a result of the scattering of light in the stroma, a phenomenon known as Rayleigh scattering. This is a similar scattering that makes the sky to look blue. No human have green or blue eye color pigmentation. This is why the eye color type is depended on the lighting that is present especially for people who have eyes which are light colored. The type of eye color is no different from the normal perception of color which is not only depended on the visual conditions but also the surrounding environment hue.
How do I change the Color of My Eyes?
You might be wondering how comes then you did not have blue eyes? The type of eye color you have are is what you inherited from your parents. The different eye colors result association of more than one color gene. Research is still underway to identify the exact genes that are responsible for your eye color. For now, they are not clearly known. You can therefore do very little to change the color of your eye types unless the color changes is as a result of medical condition rather than genetically induced.
Why Do Different Eye Colors Change as Someone Grows?
The second thing that may be baffling you is why some babies are born with very light eye color pigmentation and as they grow up, their color pigmentation rises. Research has shown that most children when they are less than one year they have eyes that are not much pigmented but as they grow, they develop cells which are known as melanocytes. These cells will the start producing pigment and therefore the eye color changes. Most children who are born with blue type of eyes are likely to remain so even as they grow whereas those who have golden eye color will have the color change to green or brown.
Other eye color changes may occur during puberty, pregnancy and if someone has a trauma for instance heterochromia. All these factors my lead to eye color changes. The Caucasians are the most affected in color changes or any other person who has hazel eyes.
How to Determine your Eye Color – Know the Type of Eye Color
Now we have understood what cause the different types of eye colors. We are yet to mention their demographical and geographical distribution. Now is the time to know how you can know the types color your eyes have. You must have signed up somewhere, may be an online dating site where they wanted you to indicate the color of your eyes or type of eye color. You just guessed brown or hazel without actually knowing your exact eye color. To know your exact eye color, you could use Eye color Chart or what is also called Martin-Schultz Scale. On this scale, the different eye colors are categorized to three broad classifications which are:-
A. The Light eyes –They range between 16-12 on Martin Scale and they are divided in two main categories:
- Light - This includes the blue, Grey and green eyes. This falls from 16-15 on Martin Scale
- Light mixed – range on 14-12 on the Martin Scale. The light mixed are further divided to:
- Very Light Mixed – have the green or blue that has some gray
- Light Mixed – Have the very light mixed components with some small amounts of brown pigmentation
B. Mixed Eyes – These types of eye colors range from 12-6 on the Martin Scale and here you will have the gray, blue or green eyes which have some brown pigmentation. Here the brown and light pigmentation have to be at the same level.
C.Dark Eyes – the dark type of eye color are classified into two major subgroups:
- Dark mixed- occupy levels 6-4 of the Martin scale and the are mainly brown eyes which have some mixtures of light pigments
- Dark – occupy the 4-1 area of the Martin Scale and they are essential the light brown, dark brown dark brown which is nearly black type of eye color.
By using either category A, B or C you will be able to know the color of your eyes or different types of eye colors.
The Different Human Eyes Colors
Having looked at the determinants different type of eye color and how you can measure your eye color, it is time that I should go ahead and covers the different type of eye color that human beings have, their geographical distribution as well as geographical distribution. I will not concentrate on the eye colors which result from medical complications but I will only focus on the normal eye colors.
1. Amber Eye Color
You should not confuse amber type of eye color for hazel. Although hazel eyes have some elements of gold and amber, they are only tiny specks. Hazel eye colors do have other colors which include the brown, orange and green and this should help you differentiate the amber and hazel eyes. Amber eyes have a sold gold hue.People who have amber types eye color normally have a yellowish golden pigmentation that is very strong anid with some coppery tint. When they go to the sunglight, they display and orange instead of a brown color. This color is probably due to the presence of lipochrome, a yellow pigmentaion. This same pigmentation is normally found in people who have green eyes.
2. Blue Eye Color
The stroma composition of blue eyed people absorbs long wave length light rays while they reflect the shorter ones. As the shorter light wavelengths get reflected, they are scattered on the stroma and the intensity of blue appearance depends on the extent of Rayleigh scattering that occurs.The other type of eye color which is much admired is the blue eyes. People who have blue eyes have their iris looking blue. However, as we have already seen, there is no blue iris that actually exists but the Rayleigh scattering effect of the stroma fluid. When surgeries are done on people who have different types of eye colors, including the blue eyed people, the iris pigment epithelium is found to be brownish black. This color is due to the presence of melanin. However, the melanin concentration is low for blue type of eye color.
Blue Eye color,Geographical and Demographical Distribution
People with this type of eye color are commonly found in Baltic Sea area, Central, South, and Northern Eastern Europe. The Middle East people which mainly include the people of Iran, Iraq, and Afghanistan including some Jewish population have blue eyes. Estonia for instance has 99% of its population having brown eyes as well as the Caucasian of the US. Around 130 million people have blue eyes worldwide when it comes to demographical distribution.
3. Brown Eyes
Majority of the human beings have this type of eye color especially the dark brown color. In some areas, dark brown eyes form the only eye colors that are present though this type of eye color are less common in Baltic Sea area and in the Scandinavian Nations.
Brown Colors Types, Geographical and Demographical Distribution
The dark brown pigmentation is common in the following regions:
- Southeast Asia
- West Asia
- South Asia
- East Asia
- Europe especially UK and Spain
However, people from Northern India, Europe and Afghanistan have a lighter pigmentation of brown eyes than the rest. This lighter pigmentation is often called the ‘honey eyes’
Brown eye colors result from a relatively high concentration of melanin in the stroma. This causes both the long and short light waves to be absorbed. More than half of the world’s population has brown eyes.
4. Grey Eye Colors Types
Here you will get a mixture of people who have either true grey eyes or bluish gray eyes. People who have gray type of eye color tend to have a dark epithelium, which is normally found at the back of your iris, and stroma which is relatively clear or transparent.
One of the explanations given to why some people have gray eye color is due to the higher levels of collagen which is present in the stroma. This makes light that has been reflected by the epithelium to undergo scattering that is not depended on frequency, a phenomenon known as ‘Mie Scattering’instead of the normal Rayleigh scattering where wavelengths that are shorter get scattered more.
Grey Eye Colors Types, Geographical and Demographical Distribution
In terms of Geographic distribution, people who have gray type of eye color are common in Eastern and Northern Europe regions, North West Africa especially parts of Algeria, Middle Eastin Iran and Afghanistan, Pakistan.
Gray eye colors may indicate presence of Uveitis and people who have gray or blue eyes have higher changes of getting uveal melanoma.
5.Green Eye Color
This people have an iris which is light green in color with some little amount of brown. The eye color may vary in the green shades as some people may have olive green eyes.
Green color is not as a result of pigmentations present but rather the as a result of stroma that is has a combination of light brown and amber pigmentation that have moderate levels of melanin and a bluish tone that is as a result Rayleigh scattering of light waves.
Green Types of Eye Colors, Geographical and Demographical Distribution
The green type of eye color is common in Northern and Central Europe and Siberia. They are also common in Northern Africa and Southern Europe. Green eyes account for about 89% of the female population in Iceland and 87% of the Male. For the European American population, there is a larger prevalence of green eyes among those whose ancestry is Slavic and Celtic.
7. Hazel Eyes
Hazel type of eye color normal arises from a combination of a moderate amount of melanin in stroma that is anterior border of the iris and Rayleigh scattering effect. Hazel eyes normally tend to have their color shifting from brown to a green shade. Normally, they have predominantly the green and brown color, and the dominating color is usually either green or gold/brown. This is why many people mistake the hazel eyes for amber and vice versa.
Hazel color definition at times becomes similar to light brown or gold and it is difficult to get a clear difference. Sometimes, people with hazel type of eye color may have an iris that has many colors, for instance, an amber/brown color near the pupil while the other parts of the iris my have dark green or charcoal color.
Red and Violet Eyes
These type of eye color is at times referred as to the red albino eyes. This is because they are very common in people who are severely affected by albino. The eye appears red when it is under certain lighting conditions due to the very low levels of melanin present and this makes blood flowing to the visible.
If this people are exposed to flash photography, they may have the effect of red eye. Here the pupil will appear red. Thought people who have deep blue eyes may seem to violet eyes; it should be clear that violet type of eye color is only in albino people.
Medical Condition that may bring Different Types of Eye Colors
Other than the above mentioned main eye colors, there are several eye disease and medical conditions that may result to certain eye colors. Some of these medical conditions include the following:
- Wilson’s Disease where
- Aniridia Disease where the iris is underdeveloped
- Ocular albinism
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