- The term "colorblind" does not necessarily mean seeing no color at all. The eye has three different color receptors, and when one malfunctions it causes a deficiency. Any kind of color deficiency in vision is called color blindness.
- A study published in the journal "Visual Neuroscience", concluded that dogs have only two color receptors in their eyes, unlike humans who have. This means that they are dichromats.
- The same study, and subsequent studies, concluded that a dog's range of colors is limited and excludes the colors green, yellow and orange.
- Stationary objects on a background of what they perceive to be the same color pose a challenge to dogs. Movement, as well as a sharp contrast in texture, make it easier for a dog to spot an object, for example a green ball on green grass.
- The specific type of colorblindness that affects dogs is called "green blindness", and is one type of red-green colorblindness, the most common type of hue deficiency among humans. The technical name is "deuteranopia".
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