Definitions for eye color

This page provides all possible meanings and translations of the word eye color

Freebase

  1. Eye color

    Eye color is a polygenic phenotypic character determined by two distinct factors: the pigmentation of the eye's iris and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium, the melanin content within the iris stroma, and the cellular density of the stroma. The appearance of blue, green, as well as hazel eyes results from the Rayleigh scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky. Neither blue nor green pigments are ever present in the human iris or ocular fluid. Eye color is thus an instance of structural color and varies depending on the lighting conditions, especially for lighter-colored eyes. The brightly colored eyes of many bird species result from the presence of other pigments, such as pteridines, purines, and carotenoids. Humans and other animals have many phenotypic variations in eye color. The genetics of eye color are complicated, and color is determined by multiple genes. So far, as many as 15 genes have been associated with eye color inheritance. Some of the eye-color genes include OCA2 and HERC2. The once-held view that blue eye color is a simple recessive trait has been shown to be incorrect. The genetics of eye color are so complex that almost any parent-child combination of eye colors can occur. However, OCA2 gene polymorphism, close to proximal 5′ regulatory region, explains most human eye-color variation.

U.S. National Library of Medicine

  1. Eye Color

    Color of the iris.

Translation

Find a translation for the eye color definition in other languages:

Select another language:

Discuss these eye color definitions with the community:


Citation

Use the citation below to add this definition to your bibliography:

Style:MLAChicagoAPA

"eye color." Definitions.net. STANDS4 LLC, 2014. Web. 30 Sep. 2014. <http://www.definitions.net/definition/eye color>.

Are we missing a good definition for eye color?


The Web's Largest Resource for

Definitions & Translations


A Member Of The STANDS4 Network


Nearby & related entries:

Alternative searches for eye color: