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The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
Blue, brown, hazel, green and all of the shades in between—there is one in the list that a small two percent of the population hold. Can you guess what the rarest eye color in the world is?
Blue eyes actually contain no blue pigment. The colour is caused by an effect called Tyndall scattering. Blue eyes do not actually contain any blue pigment. Eye colour is determined by two factors: the pigmentation of the eye's iris [48] [49] and the scattering of light by the turbid medium in the stroma of the iris. [50]
Cicadas with blue eyes. Cicadas have blue eyes because they are mutants. The University of Connecticut observed that some periodical cicadas have blue or white eyes, or some may lack red ...
[10] [11] The blue iris is an example of a structural color because it relies only on the interference of light through the turbid medium to generate the color. Blue eyes and brown eyes, therefore, are anatomically different from each other in a genetically non-variable way because of the difference between turbid media and melanin.
Hazel eyes tend to change colors due to Rayleigh scattering—the same factor that makes the sky appear blue. This optical effect occurs in the stroma, which is a thin layer of tissue in front of ...
"Once in a blue moon" refers to a rare event. [8] "Don't hold your breath" implies that if you hold your breath while waiting for a particular thing to happen, you will die first. [9] Having to wait for something “until the cows come home” [10]
50. "In real love you want the other person's good. In romantic love you want the other person." — Margaret Anderson. Related: 100 Inspiring Quotes About Moms To Celebrate Your Mom on Mother’s Day