What gives my eyes their color?
Your eye color refers to the color of each eye’s iris, a double-layered ring of muscle tissue around your pupil that controls how much light enters your eyes. The color of your iris depends on a few different factors between it and other parts of your eye.
The first main factor in your eye color is a pigment called melanin. The more melanin you have in your skin, the darker it is. Virtually everyone has melanin in the back layer of their iris (except for people with conditions like albinism).
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When you have a lot of melanin in both layers of your irises — front and back — you have brown eyes. (Experts sometimes spell the plural of iris as “irides.”) People with hazel or green eyes have less melanin in the front layer of their irises than people with brown eyes. People with little or no melanin in the front layer of their irises have blue or gray eyes.
What are the different eye colors?
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Experts don’t always agree on the main eye colors that people can have. Some scales use colors that don’t appear on others, while other scales group colors from light to dark. The main colors that appear on many scales are:
- Gray eyes.
- Blue eyes.
- Green eyes.
- Hazel eyes (various combinations of green, gold or brown).
- Amber eyes.
- Brown eyes (including shades that range from light to dark).
How many eye colors are there?
But while there are just a few main colors, the ways those colors can show up are infinitely complex. No two people have eyes with the exact same colors. Even identical twins can have subtle — but still visible — eye color differences.
Factors that contribute to the infinite number of eye color variations include:
- Iris structure. Your irises can have small dents or dips in the front layer. Those dips can cause some areas to be darker, similar to freckles on your skin.
- Eye color in one or both eyes can be inconsistent. Some people have more than one color visible in one or both eyes. Those differences can be as simple as slightly different shades, or as different as having entirely different colors on the inside of your iris vs. the outer perimeter. And in rare cases, people can have one eye that’s a completely different color from the other (heterochromia).
- Eye color can vary throughout your life. Babies’ eyes may change color before their first birthday. Some people’s eyes change colors later in life. And your eye color can even change with certain medical conditions.
Why do people with albinism have red or pink eyes?
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People with albinism have little or no melanin in their eyes. When they have very little melanin in their irises, they can have very pale blue or gray eyes. When there’s no melanin in either layer of their irises, the blood vessels in their retinas are a lot more visible, making their eyes look pink or red.
Do eye colors have any effect on my health?
Your eye color can change with certain medications or medical conditions. Some of the changes are harmless, while others are a possible sign of something serious. Some examples include:
- Cataracts.
- Glaucoma and certain medications for it.
- Horner syndrome.
- Arcus senilis.
Sometimes, your eye color can also have a link to your risk for certain diseases. People with brown eyes may have a higher risk of developing cataracts. And people with blue eyes may be more resistant to the effects of mental health conditions like seasonal affective disorder.
If you notice eye color changes that happen quickly — or that happen along with an injury or changes in how well you see — you should talk to an eye care specialist. They can tell you if it needs further attention and care.
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