Eye color is the color of the iris, the colored part around the pupil (the small black spot in the center of the eye). Fun fact: Everyone has a unique eye color, just like a fingerprint.
The most common eye color is brown, followed by blue, green, or hazel. The iris can also be a mixed color, such as brown with a golden hue, brown with a green hue, or brown with a blue hue.
The iris is located inside the eye, under a clear, colorless layer called the cornea that is less than half a millimeter thin. The iris is made up of many cells, specialized muscles, blood vessels, and nerves. Surrounding the iris is a slimy substance with millions of tiny fibers that crisscross each other.
The human body only produces brown iris pigment (melanin), not blue, green, or hazel iris pigment.
Iris pigment cells contain melanosomes. All iris colors have the same number of melanosomes, but the pigment granules inside the cells are different, for example brown irises have more pigment granules than blue irises.
Other cells of the iris make up the tiny fibers and mucus in the iris, which help protect the iris from damage. The pupil can contract or dilate thanks to special muscles of the iris with elastic fibers.
The back of the iris is a dark surface with cells filled with Posterior Surface Pigment that helps prevent light from scattering through the iris, which is good for vision.
White light contains a spectrum of rainbow colors from blue to red. When light passes through the iris, blue light scatters more than other colors and is reflected back. If there are fewer pigment particles, we will see that iris as blue.
Other colors of light, especially red, are scattered less and enter the iris between the fibers, mucus, and cells. Therefore, green, hazel, or brown eyes have more pigment granules that absorb this light.
Thus, it is the result of some colors scattering more or less light than others combined with the brown pigment particles absorbing more of some colors and the number of pigment particles that determines a person's eye color.
The color of the iris does not remain the same throughout life, but can change as darker pigments are produced in the iris cells after birth. For example, a baby with blue eyes can turn brown or hazel after just 1 day of age.
Certain diseases or injuries can also cause the color of the iris to change.
Some people are born with one brown eye and one blue eye, and this never changes throughout their lives. The cause of this is unknown.
Tired of Microsoft Teams "Download Error" Unexpected blocking your workflow? Follow our expert, step-by-step guide with quick fixes and advanced tips to resolve it instantly. No reinstall needed!
Oil heaters make noise, leak oil, and do not heat up. These are all problems that arise when using a heater. So what are the causes of these problems? Read our article below!
Master how to assign participants to breakout rooms in Microsoft Teams with this step-by-step guide. Boost meeting engagement, automate assignments, and troubleshoot like a pro for seamless virtual collaboration.
Struggling with Microsoft Teams "Price Error" after the latest pricing update? Discover step-by-step fixes to resolve it quickly, restore seamless collaboration, and avoid subscription headaches. Updated with the newest solutions.
Struggling with Microsoft Teams Background Error Transparency? Discover proven step-by-step fixes for blurry, glitchy virtual backgrounds. Restore perfect transparency in Teams meetings effortlessly. Updated with the latest solutions.
Struggling with Microsoft Teams "Đăng nhập" login error? Discover step-by-step fixes for smooth sign-in. Clear cache, update app, and more – no tech skills needed! Works on Windows, Mac, and web.
Tired of Microsoft Teams Web Error 503 Service Unavailable blocking your meetings? Discover quick, step-by-step fixes to resolve the 503 error fast – no tech skills needed! Clear cache, check status, and get back to collaborating seamlessly.
Stuck with Microsoft Teams Update Error 0x80070002? Discover proven troubleshooting steps to resolve this frustrating issue quickly and get your Teams app updated seamlessly for uninterrupted collaboration.
Tired of Microsoft Teams Error AADSTS50020 blocking your sign-in? Discover step-by-step fixes for user account conflicts, backed by the latest Azure AD solutions. Get back to work fast!
Tired of Microsoft Teams microphone error with no sound? Discover quick, step-by-step fixes for Teams mic not working on Windows, Mac, and more. Restore crystal-clear audio in minutes!
Tired of the Microsoft Teams "Task Management" Error disrupting your workflow? Discover proven fixes like clearing cache, updating Teams, and troubleshooting permissions to get back to seamless collaboration in minutes. Updated with the latest solutions.
Frustrated by the Microsoft Teams 'How to Teams' Help Error? Discover proven, step-by-step solutions to fix it quickly and restore smooth help access. Latest 2026 updates included for seamless teamwork.
Struggling with Microsoft Teams "Room Error" Syncing? This ultimate guide provides step-by-step fixes for Microsoft Teams Room Error Syncing issues, ensuring seamless meetings and quick resolutions. Updated with the latest tips.
Master troubleshooting Microsoft Teams Workflows Power Automate issues with step-by-step fixes for common errors. Get your automations running smoothly – no more frustration! Proven solutions for triggers, permissions, and more.
Struggling with Microsoft Teams "Restart Error" in 2026? Discover proven, step-by-step fixes to resolve the endless restart loop quickly. Clear cache, reset app, and more for seamless collaboration. Get back online fast!
