color vision (redirected from Colour vision)

vision /vi·sion/ (vizh´un)

1. the sense by which objects in the external environment are perceived by means of the light they give off or reflect.

2. the act of seeing.

3. an apparition; a subjective sensation of seeing not elicited by actual visual stimuli.

4. visual acuity.

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achromatic vision  monochromatic vision.

anomalous trichromatic vision  defective color vision in which a person has all three cone pigments but one is deficient or anomalous but not absent.

binocular vision  the use of both eyes together without diplopia.

central vision  that produced by stimuli impinging directly on the macula retinae.

chromatic vision  color v.

color vision 

1. perception of the different colors making up the spectrum of visible light.

2. chromatopsia.

day vision  visual perception in the daylight or under conditions of bright illumination.

dichromatic vision  defective color vision in which one of the three cone pigments is missing; the two types are protanopia and deuteranopia.

direct vision  central v.

double vision  diplopia.

indirect vision  peripheral v.

low vision  impairment of vision such that there is significant visual handicap but also significant usable residual vision.

monochromatic vision  complete color blindness; inability to discriminate hues, all colors of the spectrum appearing as neutral grays with varying shades of light and dark.

monocular vision  vision with one eye.

multiple vision  polyopia.

night vision  visual perception in the darkness of night or under conditions of reduced illumination.

oscillating vision  oscillopsia.

peripheral vision  that produced by stimuli falling on areas of the retina distant from the macula.

solid vision , stereoscopic vision perception of the relief of objects or of their depth; vision in which objects are perceived as having three dimensions.

trichromatic vision 

1. any ability to distinguish the three primary colors of light and mixtures of them.

2. normal color vision.

tunnel vision 

1. that in which the visual field is severely constricted.

2. in psychiatry, restriction of psychological or emotional perception to a limited range.

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color vision,

a recognition of color as the result of changes in the pigments of the cones in the retina that react to varying intensities of red, green, and blue light. The exact mechanisms of color vision are not completely understood, but some experts believe they depend on three specialized types of cones, each type responding to red, green, or blue light. Some retinal cones respond to the entire visual spectrum. See also color blindness.

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color

1. a property of a surface or substance due to absorption of certain light rays and reflection of others within the range of wavelengths (roughly 370 to 760 nm) adequate to excite the retinal receptors.

2. radiant energy within the range of adequate chromatic stimuli of the retina, i.e. between the infrared and ultraviolet.

3. a sensory impression of one of the rainbow hues.

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broken color

in decribing coat color, a solid color broken up by another color, usually white.

coat color

see coat color.

color dilution

reduction of the concentration of the color pigment in tissue; most important in hair and other fiber coats, in the skin and in the ocular iris.

color dilution alopecia

see color mutant alopecia.

color flow Doppler

see doppler ultrasound.

color pigments

the pigments influencing skin color are melanin, melanoid, oxygenated hemoglobin, reduced hemoglobin, carotene.

color radical

see chromophore.

color vision

the domestic animal species have limited color vision, the best perception being in bright light. Birds probably have the best, cattle and sheep the least, if any.