| colour scotoma | An area of depressed colour vision in the visual field. (05 Mar 2000) |
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| colour sense | The ability to perceive variations in hue, luminosity, and saturation of light. (05 Mar 2000) |
| colour solid | A schematic arrangement of colour in space, the attributes of hue, saturation, and brightness being represented by cylindrical coordinates. (05 Mar 2000) |
| colour spectrum | The continuum of colours that white light forms on passing through a prism or diffraction grating. Synonym: colour spectrum. (05 Mar 2000) |
| colour taste | A form of synesthesia in which the colour sense and taste are associated, with stimulation of either sense inducing a subjective sensation in the associated sense. Synonym: pseudogeusesthesia. (05 Mar 2000) |
| colour therapy | A form of phototherapy using colour to influence health and to treat various physical or mental disorders. The colour rays may be in the visible or invisible spectrum and can be administered through coloured lights or applied mentally through suggestion. (12 Dec 1998) |
| colour triangle | A graph on which chromaticity coordinates are plotted. (05 Mar 2000) |
| colour vision defects | Mild to severe impairment in the ability to discriminate or differentiate hues. This disorder may be acquired as a result of diseases of the cones or x chromosome-linked where there is an abnormality but not a complete absence of one of the cone pigments. (12 Dec 1998) |
| hair colour | Colour of hair or fur. (12 Dec 1998) |
| primary colour | The three colour's of the retinal cone pigments (red, green, blue) that may be combined to match any hue. Synonym: simple colour. (05 Mar 2000) |
| Helmholtz theory of colour vision | A theory that there are three colour-perceiving elements in the retina: red, green, and blue. Perception of other colours arises from the combined stimulation of these elements; deficiency or absence of any one of these elements results in inability to perceive that colour and a misperception of any other colour of which it forms a part. Synonym: Helmholtz theory of colour vision. (05 Mar 2000) |
| saturated colour | A colour containing a minimum amount of whiteness. (05 Mar 2000) |
| Hering's theory of colour vision | That there are three opponent visual processes: blue-yellow, red-green, and white-black. (05 Mar 2000) |
| pure colour | A visual sensation produced by light of a specific wavelength. (05 Mar 2000) |
| simple colour | The three colour's of the retinal cone pigments (red, green, blue) that may be combined to match any hue. Synonym: simple colour. (05 Mar 2000) |