Daniel Peterson is a life coach. He loves to write about unique ways to view life on healthy living and therapy blogs.
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Many people
truly believe that eyes are the windows to the soul, although they also say a
lot about your genes as well. While many people are curious about where their
own eye colours come from, knowing how it works can also potentially help
determine the eye colours for future children as well.
Why Do
Irises Have Colour?
The pigment
of your iris helps to regulate how much light enters your eyes and protect your
internal organs from dangerous UV radiation. The original colour of your irises
is determined by the amount of melanin found in the stroma.
What
Genes Determine Eye Colour?
OCA2 and HERC2
are two genes mainly responsible for eye colour. However, any combination of
the genes and its versions can result in a variety of colours and shades. For
example, a brown version of the HERC2 gene while result in brown eyes no matter
what the gey gene is.
It should
be noted that scientists uncover new information about eye colour every year.
Yet, with each piece of new information, it is possible to learn even more
about who you are and where your family comes from.
Eye
Colours Around the World
People of
European descent experience the widest range of eye colours, although it is
common to see blue and grey eyes in Northern Europe due to lower UV radiation.
Although people of African and Asian descent tend to have brown eyes due to large
amounts of melanin, some people are still born with blue eyes.
In North
America, it has been noted that blue eyes are becoming more and more rare
within the last few generations. Yet, within Estonia, 99% of people have blue
eyes.
What Are
the Most Common and Rarest Colours?
The most
common eye colour for humans is brown with blue and grey being the most second
common. The rarest eye colour is green, although there are two colour anomalies
that are even rarer still:
Albinism
When an albino person (or animal) has red or pink eyes, it is because the irises are clear (due to the lack of melanin) and it is much easier to see the blood vessels. Albinism is caused by a genetic defect that makes the body unable to produce or distribute melanin.
Heterochoromia
Heterochromia refers to the appearance of two different coloured eyes in the same person (or animal). However, it can also refer to one eye having two very distinct colours within the iris as well. In most cases, heterochromia is hereditary or caused by a disease, syndrome, or injury.
Why Do
Some People Change Their Eye Colours?
Some people
want to alter their eye colours to help build confidence or build a costume.
Fortunately, cosmetic lenses exist that can subtly or dramatically alter your
irises or entire eyes to give you a unique appearance. You can easily find cosmetic
lenses through providers such as Lenstore.co.uk.
As you can
see, you can learn plenty about yourself and your family history by studying
your eye colour. However, whether you choose to change or embrace your natural
eye colour is entirely up to you.
I always find genetics and how they express themselves in our physical appearance interesting. Wow, in Estonia 99% of people have blue eyes?! I always think of blue eyes as a recessive trait so it's surprisingly that THAT many people have them
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