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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?
The appearance of blue, green, and hazel eyes results from the Tyndall scattering of light in the stroma, a phenomenon similar to Rayleigh scattering which accounts for the blue sky. [5] Neither blue nor green pigments are present in the human iris or vitreous humour .
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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 ...
In sectoral heterochromia, areas of the same iris contain two different colors, the contrasting colors being demarcated in a radial, or sectoral, manner. Sectoral heterochromia may affect one or both eyes. [31] It is unknown how rare sectoral heterochromia is in humans, but it is considered to be less common than complete heterochromia.
In 1983, Hewitt D. Crane and Thomas P. Piantanida performed tests using an eye-tracker device that had a field of a vertical red stripe adjacent to a vertical green stripe, or several narrow alternating red and green stripes (or in some cases, yellow and blue instead). The device could track involuntary movements of one eye (there was a patch ...
Martin-Schultz scale. The Martin–Schultz scale is a standard color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual; it was created by the anthropologists Rudolf Martin and Bruno K Schultz in the first half of the 20th century.
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 ...