CAD Test
The Color Assessment and Diagnosis Test is a type of Mosaic Test.
CAD Test
The Color Assessment and Diagnosis (CAD) Test was known previously at The City University Dynamic Colour Vision Test. It is a video-based screening tool for CVD devised in 1994 (originally described in Barbur 1994) specifically for the aviation industry. It…
CAM Lantern
The Fletcher-Evans CAM Lantern was produced in 2000 to replace the defunct Holmes-Wright Lanterns. Each of these are used for color vision screening for the UK Navy, Merchant Marine, RAF, and Civil Aviation. Fletcher CAM Lantern
Camouflage
During WWII, Colorblind individuals were chosen to be snipers supposedly for their improved ability to see camouflaged targets. Academic literature since then has mostly disproved this claim. https://youtu.be/Xj3vVtyMcJU
Carrier
An individual is a carrier for CVD when they do not exhibit a colorblind Phenotype, but are capable of passing CVD genes to their offspring. https://youtu.be/kqUseNNfux4
Chroma
Often one channel of a 3D Color Space. Determines the vibrancy of a color. Equivalent to Saturation or Colorfulness.
ChromaGen
A producer of Monocular Lenses. Website
Chromatic Aberration
A property of optics that is wavelength dependent. This can lead to distortions in color. For example, lenses with Refractivity that is Wavelength dependent can generate images that have colored fringes. https://youtu.be/Xj3vVtyMcJU
Chromatic Adaptation
The ability of vision to adjust the neutral point of an image to remove color cast of an image. https://youtu.be/9WDr4e8eJmc
Chromaticity Diagram
A diagram that represents a 3D Color Space as a 2D Color Space by removing the brightness channel. Chromaticity is the combination of Hue and Chroma. CIE 1931 Chromaticity Diagram with Planckian Locus
Chromatophene
A type of Phosphene that specifically excites perception of color. These are generally in the form of colored rings or halos that appear when magnetically exciting the visual cortex (V4).
Chromesthesia
Also Sound-Color Synesthesia; A type of Synesthesia where sounds can cause an individual to see color despite that color not stimulating the Retina. The inducing sound can be music, phonemes, speech, and/or everyday sounds. See also Eyeborg. A mapping of…
Chromophore
The pigment of a Photoreceptor. Human Photoreceptors (rods and cones) consist of: Chromophore - a small molecule called Retinal at the center that absorbs the photon. It is a type of Vitamin A.Opsin - a large protein that surrounds the…
CIE
The International Commission on Illumination (abbreviated CIE for its French name, Commission internationale de l'éclairage) is the international authority on light, illumination, colour, and colour spaces. It was established in 1913 and is today based in Vienna, Austria. Conferences of…
CIE 1931
A very common Color Model that connects Spectroscopy (spectra of light) to Color (Tristimulus values). CIEXYZ is the main Color Space that represents the model.
CIECAM02
A Color Model published by the CIE in 2002 that is intended to reconcile the differences between CIELAB and CIELUV.
CIELAB
or more specifically CIE L*a*b*; A Color Space of the CIE 1976 Color Model that is an update of the CIEXYZ Color Space. It contains all of the colors that are visible to the Standard Observer. Unlike CIEXYZ, it is…
CIELUV
or more specifically CIE 1976 L*, u*, v*; A Color Space of the CIE 1976 Color Model that is an update of the CIEUVW Color Space. It contains all of the colors that are visible to the Standard Observer. It…
CIEUVW
or more specifically CIE 1964 (U*, V*, W*); A Color Space of the CIE 1960 Color Model that is intended to be Perceptually Uniform. It was mostly superseded by CIELUV.
CIEXYZ
One of the Color Spaces of the CIE 1931 Color Model. It contains all of the colors that are visible to the Standard Observer. The Chromaticity Diagram is usually displayed in this Color Space. CIEXYZ is typically used as the…
City University Test
Also called The City University Colour Vision Test or TCU Test; A screening tool for CVD devised by the Department of Optometry and Visual Science in the City University of London in 1977. A 2nd edition in 1980 fixed some…
CMY
A subtractive, Trichromatic Color Model that is used to describe the mixing of colors of pigments (not light sources). Cyan, Magenta and Yellow are the Primary Colors and are added together in various ways to reproduce a broad array of…
CMYK
A subtractive Color Model that is chromatically identical to the CMY Color Model, but includes black (K) ink in order to extend the brightness contrast of CMY. While there are 4 inks used, it is still only a trichromatic (not…
Co-punctal Point
A single point on the Chromaticity Diagram where all lines of confusion converge. The position of the co-punctal point therefore completely defines the Confusion Lines for each type of Dichromacy. The co-punctal point for Protanopia is shown.
Coexpressed Opsins
Two different opsins (with different peak wavelengths) that occupy the same photoreceptor. This is one reason that the number of opsins in an organism's genome, or the number of opsins expressed are not perfect indicators of the 'depth' of color…