The eye is a round organ for sensing light so organisms can see. It is the first part of the visual system. About 97 percent of animals have eyes. Imageresolving eyes are present in cnidaria, molluscs, vertebrates, annelids and arthropods. In mammals, two kinds of cells, rods and cones, allow sight by sending signals through the optic nerve to the brain. Some animals can see light that humans cannot …
Download Image: download
