Light, no matter how complex its composition of wavelengths, is reduced to three color components by the eye. For each location in the visual field, the three types of cones yield three signals based on the extent to which each is stimulated. These amounts of stimulation are sometimes called tristimulus values.
https://en.wikipedia.org/wiki/Color
The iris, visible through the clear cornea as the colored disc inside of the eye, is a thin diaphragm composed mostly of connective tissue and smooth muscle fibers. It is situated between the cornea and the crystalline lens. The. texture, and patterns of each person s iris are as unique as a fingerprint.
http://www.tedmontgomery.com/the_eye/iris.html
The iris is divided into two major regions: 1  The pupillary zone is the inner region whose edge forms the boundary of the pupil. 2  The ciliary zone is the rest of the iris that extends to its origin at the ciliary body.
https://en.wikipedia.org/wiki/Iris_(anatomy)
Some pigment causes the iris to appear blue. Increasing amounts of iris pigment produce green, hazel, and brown irises (or irides). There actually are two pigments, melanin and lipochrome, which determine eye color. Melanin (brown) deposition is controlled by a gene on chromosome 15.
http://www.tedmontgomery.com/the_eye/iris.html
1 Hue: the color's direction from white, for example in a color wheel or chromaticity diagram. 2  Shade: a color made darker by adding black. 3  Tint: a color made lighter by adding white. 4  Value, brightness, lightness, or luminosity: how light or dark a color is.
https://en.wikipedia.org/wiki/Color
Color, or colour (see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, blue, yellow, etc. Color derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors.
https://en.wikipedia.org/wiki/Color
For other uses, see Iris (disambiguation) . The iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
https://en.wikipedia.org/wiki/Iris_(anatomy)
Occasionally, the color of the iris is due to a lack of pigmentation, as in the pinkish-white of oculo-cutaneous albinism, or to obscuration of its pigment by blood vessels, as in the red of an abnormally vascularised iris.
https://en.wikipedia.org/wiki/Iris_(anatomy)
The color of the iris gives the eye its color. In optical terms, the pupil is the eye's aperture and the iris is the diaphragm that serves as the aperture stop.
https://en.wikipedia.org/wiki/Iris_(anatomy)
It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what we commonly refer to simply as light).
https://en.wikipedia.org/wiki/Color
what gives iris its color
The color of the iris gives the eye its color.