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  2. Cat senses - Wikipedia

    en.wikipedia.org/wiki/Cat_senses

    A cat's visual acuity is anywhere from 20/100 to 20/200, which means a cat has to be at 6 metres to see what an average human can see at 20 or 30 metres. Cats seem to be nearsighted, which means they cannot see far objects as well. The ability to see close objects would be well-suited for hunting and capturing prey. [2]

  3. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    The basis for this variation is the number of cone types that differ between species. Mammals, in general, have a color vision of a limited type, and usually have red–green color blindness, with only two types of cones. Humans, some primates, and some marsupials see an extended range of colors, but only by comparison with other mammals.

  4. Monochromacy - Wikipedia

    en.wikipedia.org/wiki/Monochromacy

    Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats.

  5. Achromatopsia - Wikipedia

    en.wikipedia.org/wiki/Achromatopsia

    Some colors can be estimated through the use of colored filters. By comparing the luminosity of a color with and without a filter (or between two different filters), the color can be estimated. This is the premise of monocular lenses and the SeeKey. In some US states, achromats can use a red filter while driving to determine the color of a ...

  6. Dichromacy - Wikipedia

    en.wikipedia.org/wiki/Dichromacy

    Dichromacy in humans is a form of color blindness (color vision deficiency). Normal human color vision is trichromatic, so dichromacy is achieved by losing functionality of one of the three cone cells. The classification of human dichromacy depends on which cone is missing: Protanopia is a severe form of red-green color blindness, in which the ...

  7. 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.

  8. Cat's Human-Like Way of Saying 'Hello' Immediately Brings ...

    www.aol.com/cats-human-way-saying-hello...

    Both Stevie and Nonna belong to the Munchkin cat breed, which can come in almost any coat color. Munchkin cats are known for their short, stumpy legs and affectionate personalities, though these ...

  9. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Such findings may give an evolutionary reason for the high rate of red–green color blindness. [18] There is also a study suggesting that people with some types of color blindness can distinguish colors that people with normal color vision are not able to distinguish. [17] In World War II, color blind observers were used to penetrate camouflage.

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