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2. Eye color - Wikipedia

   en.wikipedia.org/wiki/Eye_color

   Hazel eye Hazel eye. Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer. [4] [35] Hazel eyes often appear to shift in color from a brown to a green. Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown/gold or green.

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

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

   This is what causes hazel eyes and their many hues. 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 ...

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

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

   Out of the conventional eye colors we'd think of—brown, blue, hazel and green—green is the rarest of the four. Only about two percent of the world's population has naturally green eyes.

5. Martin scale - Wikipedia

   en.wikipedia.org/wiki/Martin_scale

   The original Martin scale, summarized below, consists of 16 colors (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris. The numbering is reversed in order to match the Martin–Schultz scale, which is still used in biological anthropology. In this case ...

6. Human eye - Wikipedia

   en.wikipedia.org/wiki/Human_eye

   Hazel eye. Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer. [41] Hazel eyes often appear to shift in color from a brown to a green. Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown/gold or green.

7. Heterochromia iridum - Wikipedia

   en.wikipedia.org/wiki/Heterochromia_iridum

   The affected eye may be hyperpigmented (hyperchromic) or hypopigmented (hypochromic). [3] In humans, an increase of melanin production in the eyes indicates hyperplasia of the iris tissues, whereas a lack of melanin indicates hypoplasia. The term is derived from Ancient Greek: ἕτερος, héteros "different" and χρῶμα, chrôma "color ...