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Why people living in India and UK have different eye color ?
Question Date: 2012-10-19
Answer 1:

In any country you will find people with different eye colors. Here’s a nice Youtube video that shows many different light eye colors in Indian people:

watch this video.

Brown eyes are more common in India, but I don’t have any actual numbers. I found a source that gave some values for light-colored eyes in the UK: Scotland--80%, England--74%, and Wales-- 68%.

Eye color depends mostly on genes. In most science textbooks it says that Brown is dominant to blue, but you have probably noticed that there are many shades of eye color, not just two. This tells us that the story is not that simple.

One thing that causes eyes to be darker is having more brown eye color, or pigment. Melanin is the pigment that gives our hair, skin, and eyes their color. Some people have slightly different recipes for melanin, so their eyes may be a different color. The amount of pigment also makes a difference. Eyes may be brown, but be darker or lighter than someone else’s depending on the amount of melanin. The actual structure of the iris (the colored ring) also influences the color. You know how a glass of water looks clear, but the ocean or a lake looks blue or green? That’s because there are a lot of tiny particles in the water that absorb, and scatter the light. The fluid in your iris scatters light too. That’s where green and blue colors come from.

There’s some evidence that darker eyes are a little better for seeing when there is a lot of light, because the iris absorbs more light.

Eyes with less pigment may allow a person to see color in slightly lower light. These are really small differences, though. The reason darker eyes are more common in India may be due to there being more sun. It could also just be random chance. Mutations that caused lighter eyes may just have happened a bit more often in some areas of the world. It could also be that people who didn’t make enough melanin to make their skin dark did not survive as well in sunny India as in foggy Europe.

Do you think social attitudes about eye color influence eye color in later generations?

Thanks for asking,

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