Imagine you are waving your red colour shirt to your dog. Does your dog see it as the same energetic charging red or as dark grey? Or does your dog also see the grass as lush green as you do? Let us try to quickly decipher these questions.
Concept of cones
Retina of a human eye contains receptors called ‘cones’ which perceive colours. A human eye consists of three types of receptors each for red, blue and green light. Rest of the colours that we perceive are just a combination of these three colours. A dog only has two types of cones each for blue and yellow colour. Hence the number of colours that a dog can perceive will be slightly less than that of an average human.
What this also means is that your dog may not appreciate the red colour in the dog toys that you recently bought for him as to him it is more like brown.
Concept of rods
But make no mistake of assuming that your vision is superior to your dog. A Dog’s retina has far higher no. of ‘rods’, which sense the intensity of light and the resultant ability to sense shape and movement in the dark. This higher concentration of rods in a dog’s eyes gives them a superhuman ability to see in dim light. Buy a pair of military grade night goggles to see how your dog sees at night.
Glowing eyes at night
Dogs also have tapetum lucidum, which are biological reflectors that help increase vision capabilities. This reflector system leads to the scary glowing animal eyes at night. An ability to see in the dark is far more pronounced in nocturnal animals like foxes and wolves who like to hunt in darkness.