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  2. ColorADD - Wikipedia

    en.wikipedia.org/wiki/Coloradd

    ColorADD is a sign code for aiding color blind people to recognise colors, developed by Portuguese graphic designer and professor at the University of Minho, Miguel Neiva. [1] It consists of geometric shapes representing colors and color combinations. The app won the accessibility category of the 2013 Vodafone Foundation Mobile For Good Europe ...

  3. Evolution of color vision in primates - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_color_vision...

    Hence, the New World primate color vision alleles are likely to have arisen after Old World gene duplication. [4] It is also proposed that the polymorphism in the opsin gene might have arisen independently through point mutation on one or more occasions, [ 4 ] and that the spectral tuning similarities are due to convergent evolution.

  4. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    An issue with color selection is that the colors with the greatest contrast to the red–green color blind tend to be colors of confusion to the blue–yellow color blind and vice versa. In 2018, UX designer Allie Ofisher published 3 color palettes with 6 colors each, distinguishable for all variants of color blindness.

  5. Trichromacy - Wikipedia

    en.wikipedia.org/wiki/Trichromacy

    Trichromatic color vision is the ability of humans and some other animals to see different colors, mediated by interactions among three types of color-sensing cone cells. The trichromatic color theory began in the 18th century, when Thomas Young proposed that color vision was a result of three different photoreceptor cells .

  6. Dichromacy - Wikipedia

    en.wikipedia.org/wiki/Dichromacy

    The resulting color vision is simpler than typical human trichromatic color vision, and much simpler than tetrachromatic color vision, typical of birds and fish. A dichromatic color space can be defined by only two primary colors. When these primary colors are also the unique hues, then the color space contains the individuals entire gamut. In ...

  7. Evolution of color vision - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_color_vision

    Researchers studying the opsin genes responsible for color-vision pigments have long known that four photopigment opsins exist in birds, reptiles and teleost fish. [3] This indicates that the common ancestor of amphibians and amniotes (≈350 million years ago) had tetrachromatic vision — the ability to see four dimensions of color.

  8. Color blind glasses - Wikipedia

    en.wikipedia.org/wiki/Color_blind_glasses

    Color blindness (color vision deficiency) is the decreased ability to see color or differences in color. It can impair daily color tasks such as selecting ripe fruit or choosing clothing, as well as safety-related tasks such as interpreting traffic lights. While the disability of color blindness is considered minor, the use of color in safety ...

  9. Blindness in animals - Wikipedia

    en.wikipedia.org/wiki/Blindness_in_animals

    Mammals other than primates generally have less effective two-receptor color perception systems, allowing only dichromatic color vision; marine mammals have only a single cone type and are thus monochromats. Honey- and bumblebees have trichromatic color vision, which is insensitive to red but sensitive in ultraviolet to a color called bee purple.