Humans see the seven colour spectrum, dogs do not see red, green or violet.
Dog eyes have more rods (scotopic vision) than cones (photopic vision) (photoreceptor cells) in their retina, whereas human eyes have more cones, & this makes the difference in colour perception. •Humans are trichromatic, having three kinds of cones, blue, red & green. •Dogs are dichromatic, having only two types of cones, blue & another between the human red & green cone. However, these colours do not affect a dog’s sight. In fact, dogs have more rods in their eyes than humans, which allow for better vision in very low light. Dogs also have a reflective mechanism, a retroflector called the tapetum lucidum. Whereby the dogs eyes reflect the light that goes into their eyes back out, allowing a much more detailed view of the world after dark. Maybe consider choosing blue & yellow coloured items for your dog? *There are some types of birds, fish & insects that can see an even broader range of the colour spectrum than humans can. •These are tetrachromatic, having a fourth type of cone receptor to absorb ultraviolet light. -Birds of Paradise have “glowing” spectacular colours to attract mates! It’s Evolution baby!! Colour blindness can occur when one or more of the cone types are not functioning as expected. Cones can be absent, non-functioning or detect a different colour. © 2019-2023 Sarah MSc's Blog. Image authorship unknown. Great visual! Comments are closed.
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