The "fourth" type of colorblindness (after Protan, Deutan & Tritan) that acts as an umbrella term for Tetartanomaly and Tetartanopia. Tetartan CVD affects the blue-yellow Opponent Channel (generally a weakening of the yellow stimulation). There are no known congenital causes…

A type of blue-yellow Anomalous Trichromacy that has many theoretical mechanisms, but none of which have ever been detected in humans. It would have the same similarities to Tritanomaly that Deuteranomaly has to Protanomaly. Tetartanomaly would require a 'weakening' of…

A type of blue-yellow Dichromacy that exists only theoretically as part of the Opponent Process Theory. The blue-yellow opponent channel is a balance between the excitation of the S-Cones (representing blue) and the sum of excitations of the L- and…

Color vision defined in 4 dimensions (generally, have 4 different types of Cones). There are two types of Tetrachromats: Weak - the individual has 4 cones, but they do not have 4 dimensional color vision and their Gamut can be…

An individual with Tetrachromacy.

A meme from 2015 where the internet was bitterly divided on the color of the dress, with some adamant is was blue-and-black and others adamant it was white-and-gold. The confusion stems from the role that Illuminants play in determining an…

An event where an opsin is triggered without catching a photon. This still gives the perception of light and therefore acts as "noise in the signal". The higher the rate of Thermal Activation, the more noise there is, and the…

A measurement of light that passes through an object, such as a filter. Transmissibility is a function of Wavelength. It is a product of the shape of the object and the material Transmittance. For example, the Transmissibility of EnChroma lenses…

Color vision defined in 3 dimensions (generally, have 3 different types of Cones). Trichromats need 3 primary colors to represent all of the colors in the Gamut of a Color Normal human. Trichromacy is actually quite rare in the animal…

Three parameters corresponding to the stimulus levels of the three Cones. In principle, the Tristimulus Values can represent any human color sensation. The three parameters, denoted "S", "M", and "L", are indicated using a 3-dimensional Color Space called LMS. The…

The "third" type of colorblindness (after Protan and Deutan) that acts as an umbrella term for Tritanomaly and Tritanopia. Tritan CVD is associated with the blue cone and affects the blue-yellow Opponent Channel (generally a weakening of the blue stimulation).…

In literature, the prevalence of Tritans (<1/3000) is much lower than for Red-Green Colorblindness (~1/25). However, the number of self-reported Tritans in Colorblind communities is on par with the Protans and Deutans. This discrepancy comes down to several factors: Tritans…

A common type of Colorblindness. It is the Tritan form of Anomalous Trichromacy. https://www.youtube.com/watch?v=3qFAtbMQqkE

A common type of Colorblindness. It is the Tritan form of Dichromacy. https://www.youtube.com/watch?v=3qFAtbMQqkE

This term is used to describe the "real" or "correct" color. However, there is no such thing as True Color. Color is not a physical property of an object and is not an inherent property of a Spectrum. The conversion…