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Rather, blue eyes result from structural color in combination with certain concentrations of non-blue pigments. The iris pigment epithelium is brownish black due to the presence of melanin. [54] Unlike brown eyes, blue eyes have low concentrations of melanin in the stroma of the iris, which lies in front of the dark epithelium.
According to CNN, Dr. Gary Heiting, a licensed optometrist and senior editor of All About Vision explained why all human eyes are actually brown, no matter if they look blue or greenish.
Human eye pigmentation in Europe Among human phenotypes, blue-green-gray eyes are a relatively rare [citation needed] eye color and the exact color is often perceived to vary according to its surroundings. The iris is usually strongly pigmented, with the color typically ranging between brown
Central heterochromia, blue with brown. Central heterochromia is also an eye condition where there are two colors in the same iris; but the arrangement is concentric, rather than sectoral. The central (pupillary) zone of the iris is a different color than the mid-peripheral (ciliary) zone.
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We all wonder what people think when they see our appearance. Turns out, your eyes speak
Blue eyes are also found in parts of Western Asia, most notably in Afghanistan, Syria, Iraq, and Iran. [53] In Estonia, 99% of people have blue eyes. [54] [55] In Denmark in 1978, only 8% of the population had brown eyes, though through immigration, today that number is about 11%. [55] In Germany, about 75% have blue eyes. [55]
The second (sciencedaily.com) states that "“It used to be thought that eye colour was what we call a simple Mendelian recessive trait - in other words, brown eye colour was dominant over blue, so a person with two brown versions of the gene or a brown and a blue would have brown eyes, and only two blues with no brown could produce blue eyes ...