so do the eyes. Most birds and reptiles see color with four types of cone photoreceptors, each carrying an opsin that’s tuned to a different color. But mammals evolved from a nocturnal ancestor ...

Dogs see differently than humans. The reason lies within the eye. In the eye are light receptors called cones and rods. Cones help us distinguish different colors, while rods help us see in dim light.

In fact, many bats, nocturnal snakes and lizards have no cones at all, while other nocturnal animals have just a few. Many nocturnal eyes are equipped with a feature designed to amplify the amount ...

Doc Ophthalmol 1994;86(2):123–51. Weleber RG, Eisner A . Cone degeneration (‘bull's eye dystrophies’) and colour vision defects. In: Newsome DA, editor. Retinal dystrophies and degenerations.

Rods are light-sensitive cells, and cones are sensitive to colour. Chameleons have some of the strangest eyes on the planet, which are able to move independently of each other. This results in almost ...

Iso-orientation areas in the foveal cone mosaic. Vis Neurosci 1990;5:511–23. Bron AJ, Tripathi RC, Tripathi BJ . Wolff's anatomy of the eye and orbit. 8th ed. London: Chapman and Hall ...