When I think about my vision I am so happy that I can see with the full spectrum of visible light (colour) . I know different animals can only see certain colours, sometimes just black and white and but others like snakes and insects can even see into the infra red and ultra violet.
Then there is colour blindness, where some cells in a person’s eye are not properly developed or can be missing. Then they have colours missing from their vision. For instance red green colour blindness. Apparently males suffer from this more than females. As I say I feel lucky to have good colour vision. X