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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.
The iris (pl.: irides or irises) is a thin, annular structure in the eye in most mammals and birds that is responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm. Eye color is defined by the iris.
Iris is an ambiguous color term, usually referring to shades ranging from blue-violet to violet. However, in certain applications, it has been applied to an even wider array of colors, including pale blue, mauve, pink, and even yellow (the color of the inner part of the iris flower).
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. Central heterochromia is more noticeable in irises containing low amounts of melanin. [32]
Iris albicans – white cemetery iris, white flag iris; Iris alexeenkoi Grossh. Iris aphylla L. – stool iris, table iris, leafless iris (including I. nudicaulis) Iris aphylla subsp. hungarica (Waldst. & Kit.) Helgi ; Iris attica (Boiss. & Heldr.) Hayek; Iris benacensis A.Kern. ex Stapf; Iris bicapitata Colas; Iris croatica – Perunika I ...
The scale consists of 20 colors [1] (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 (in this case, the lower the number, the lighter the eye color): [2] [3]
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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 ...