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The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [1]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.
Baboons, like other old world monkeys and apes, have eyes which can discern blue, green and red wavelengths of light. The evolution of color vision in primates is highly unusual compared to most eutherian mammals.
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The opponent process is a color theory that states that the human visual system interprets information about color by processing signals from photoreceptor cells in an antagonistic manner.
Jameson et al. [14] have shown that with appropriate and sufficiently sensitive equipment it can be demonstrated that any female carrier of red–green color blindness (i.e. heterozygous protanomaly, or heterozygous deuteranomaly) is a tetrachromat to a greater or lesser extent.
Anatomy of the avian eye. The main structures of the bird eye are similar to those of other vertebrates.The outer layer of the eye consists of the transparent cornea at the front, and two layers of sclera — a tough white collagen fibre layer which surrounds the rest of the eye and supports and protects the eye as a whole.
Colored pencils. Color (or colour in Commonwealth English; see spelling differences) is the visual perception based on the electromagnetic spectrum.Though color is not an inherent property of matter, color perception is related to an object's light absorption, reflection, emission spectra, and interference.
Humans normally have three types of cones, usually designated L, M and S for long, medium and short wavelengths respectively. [7] L cones respond most strongly to light of the longer red wavelengths, peaking at about 560 nm, and make up the majority of the cones in the human eye.