What is the first thing most of us notice when we look at others? I don’t know about you but I look at the eyes. I’m not sure what you guys were thinking. Eyes are the most talkative part of a person’s body. Believe it or not, just by looking into somebody’s eyes we know what they are going through. Psychologists and health practitioners have in-depth knowledge of assessing patients just by looking into the eyes and eye colours. But I personally think it is only a matter of time until one knows how to read eyes. Therefore the elderly in society are more likely to understand what ‘eyes’ say.

Let us dive into the secret of different eye colours people have.

Brown eyes

The colour of the eye is directly related to the amount of melanin pigment present in the iris. More the pigment, more darker your eyes will be. It is believed that all humans had brown eyes in the starting phase of humanity. Later the geographic and environmental changes led to mutations and eye colours change. Currently, around 75% – 80% of the total world population has brown eyes. Brown eyes are more resistant to damage. More melanin keeps the eyes moist and also helps to repair DNA damage.

Blue eyes

eye colours

10% of the total population of the earth has blue eyes. This colour type is recessive to brown. It is quite likely possible that all blue-eyed people had a common ancestor. The most fascinating eyes might be blue ones because their colour is totally anatomical. Blue-eyed individuals have stromas that are entirely colourless, devoid of any pigment, and devoid of extra collagen deposition. This indicates that all of the light that enters it is scattered back into the atmosphere, where the Tyndall effect gives it a blue hue.

This is interesting because it shows that the colour of blue eyes depends entirely on the quantity of light present when you gaze at them.

Hazel eyes

Only 5% of the population has hazel eyes. Although there are many various factors that contribute to hazel eyes, Rayleigh scattering, which is a moderate quantity of melanin within the inner border of the iris, is the most important.

Although hazel eyes show blue, green, or amber shimmer, these colour pigments are not found in human eyes, hence it is a mystery where the colour of hazel eyes actually comes from.

Green eyes

eye colours

2% of the total population has green eyes. To put the genuine rarity of green eyes into perspective, consider that brown eyes are 28 times more common than green eyes worldwide.

Although green eyes are a unique colour, it is possible for the colour to change during the day. Someone’s green eyes may appear “hazy” when they first awaken. As the body distributes vitamins and blood during the day, this colour may grow darker.

A whopping 86% of Icelanders have green eyes.

Grey eyes

eye colours

1% of the entire population possess grey eyes. People with grey eyes have less melanin and are more likely to develop ocular melanoma, an eye cancer. Even though this malignancy is extremely uncommon, affecting six out of every million individuals in the U.S. each year. It is still a good idea to wear those UV-blocking sunglasses.

The exact reason of grey eyes is still a mystery. But according to scientists, the genetics behind grey eyes and those behind blue eyes might be strikingly similar.


eye colours

Different-coloured eyes in the same person is known as heterochromia. The majority of heterochromia cases are genetic, brought on by a disease or syndrome, or as a result of trauma. The colour of one eye can sometimes change as a result of certain illnesses or injuries. It is often mistaken as an eye disease. Heterochromia does not affect the vision of a person.

This is the most common condition observed in dogs. It is estimated that less than 1% of the entire human population has heterochromia.

Tell us in the comments what is your eye color and how common is it? Did you get some interesting information out of the blog? And what else would you like to read? Your feedback is really appreciated.

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2 thoughts on “The secret behind different eye colours”
  1. Good day @Prajwal Patil
    This Post of yours is amazing as it provides very beautiful information about the color of our eyes but I would very much appreciate if you at least justify your title “The secret behind different eye colors” as you are just giving information about the different eye colors but not telling about the reason of eye colors i.e. about the Mendelian Traits as in its Dominant and Recessive traits.
    It is color of the eyes are determine by the amount of melanin produced but the amount of melanin produced depends on the gene controlling that particular trait for the color.
    Good luck with your work
    Thank you

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