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According to religious anti-evolutionists (including supporters of "intelligent design"), species of living organisms were created by intelligent beings who had the opportunity to design every kind of species "from scratch", that is, for each type of design there is a unique plan of structure that best fits the tasks that, according to the Creator's plan, this type of species is made for. The theory of those who do not believe in evolution thus predicts the existence of a set of ideal, unique and unrelated to each other plans of the creation of species, or just refuses to predict referring to the inscrutability of will of the Creator.
Science, on the other hand, argues that the species occurred in the course of evolution from one another due to natural causes, without the intervention of reasonable force. In addition, each species is not designed from scratch, and appeared as a result of relatively small modifications of its ancestral species, inheriting most of its properties including those that the new kind does not need anymore, and which are not necessarily optimal for those conditions in which a new kind exists.
It is known that the ability of all terrestrial mammals are equally good to see both near and distant objects due to the change in curvature of the lens, which is achieved by reduction of the ciliary muscles of the eye. Dolphins do not have this muscle and the lens has a constant spherical shape. Such "convex glasses" allow the dolphins to see objects well under the water.
Even those people who have highly developed sight can be considered a kind of blind compared with an eagle, each of us probably heard this expression about the eagle eye. Sharp vision of this majestic bird is not a myth, but pure biology. The answer is in the structure of this bird’s eyes. If the eagle flies at an altitude of 1500 meters, it can see a rabbit, who is hiding in the grass.
Eyesight and wha an eagle looks like, helps the birds to see their prey from a distance while the process of haunting. Eagles can almost precisely determine the distance to the victim. In the eye of the eagle there is more than a million of visual cells. The eyes of this bird have evolved not only to see, but they have ways to increase the image up to eight times. An eagle may see within a radius of 300 degrees. That is, flying at an altitude of 4500 meters, its eagle eye covers the area of 30 000 hectares.
Another very important step in evolution is color vision. Color vision occurs at very early stages of the evolutionary ladder: different insects had color vision (bees, flies, butterflies). However, the sensitivity range of insects is shifted into the ultraviolet region (to the detriment of the red). Best of all they see yellow, blue, purple hues, and red color is perceived, probably as black.
Many mammals, like we humans see the world around volumetric, three-dimensional. But the colorful splendor in their eyes appears to be darkened. Most mammals have lost their color vision in whole or in part. Twilight and nocturnal animals, for example wolves and other wild animals hardly distinguish colors. Rodents (rabbits and mice), as well as artiodactyl do not distinguish colors. Weak color vision have dogs and cats.