Search results
Results from the WOW.Com Content Network
While the spectrum of eye colors is as vast as the human ... 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 ...
Eye color. 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. [3]: 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of ...
Heterochromia iridum. Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment). It may be inherited, or caused by genetic mosaicism ...
Color blindness or color vision deficiency (CVD) is the decreased ability to see color or differences in color. [2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone ...
But, how rare are hazel eyes? Eye color is primarily determined by the amount and distribution of melanin within the front part of the iris—the colored part of the eye. This pigment's ...
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. Organisms with tetrachromacy are called tetrachromats. In tetrachromatic organisms, the sensory color space is four-dimensional ...
Human color sensation is defined by the sensitivity curves (shown here normalized) of the three kinds of cone cells: respectively the short-, medium- and long-wavelength types. Impossible colors are colors that do not appear in ordinary visual functioning. Different color theories suggest different hypothetical colors that humans are incapable ...
Lens (the clear inner part of the eye that helps the eye focus) Retina (the light-sensitive tissue lining the back of the eye) Macula (the part of the retina needed for central vision)