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  2. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color is a polygenic phenotypic trait determined by two ... North Africa, and South America. [37] Hazel. ... Gray is the second-rarest natural eye color after ...

  3. How Rare Are Hazel Eyes, Exactly? - AOL

    www.aol.com/rare-hazel-eyes-exactly-100600193.html

    Related: The Rarest Eye Color in the World: What It Is and Why. What Causes Hazel Eyes? Eye color is determined by the amount and distribution of melanin in the iris of the eye, in addition to the ...

  4. The Rarest Eye Color in the World: What It Is and Why

    www.aol.com/lifestyle/rarest-eye-color-world-why...

    Grey eyes make up about 3 percent of the world's population—the second rarest eye color. There are also rare cases of violet and red-colored eyes. What Determines Eye Color?

  5. Heterochromia iridum - Wikipedia

    en.wikipedia.org/wiki/Heterochromia_iridum

    Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7]

  6. How Rare Are Green Eyes, Exactly? - AOL

    www.aol.com/lifestyle/rare-green-eyes-exactly...

    The percentage of the population with green eyes may surprise you.

  7. Tetrachromacy - Wikipedia

    en.wikipedia.org/wiki/Tetrachromacy

    The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [1]Tetrachromacy (from Greek tetra, meaning "four" and chroma, meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye.

  8. Waardenburg syndrome - Wikipedia

    en.wikipedia.org/wiki/Waardenburg_syndrome

    Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin.

  9. This is what your eye color could reveal about your ...

    www.aol.com/article/lifestyle/2017/10/17/this-is...

    Let’s just hope your parent doesn’t have the rarest hair and eye color combination in the world; in that case, your options could be somewhat limited.