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The Animal Kingdom and Their Diversity of Vision

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The world today has many different types of living organisms. Each species has a specific eye type that is unique to their kind. Here we will discuss the differences between the eye mechanisms of aquatic and terrestrial animals versus the four-eyed fish. The most common eye type which is ideal for image vision is camera-type eyes. Terrestrial animals consist of animals that live mostly on land such as flies, cats, dogs, bears, deer, cows, tigers, humans, etc. Aquatic animals consist of animals which live in water for most of their life such as fishes, whales, frogs, mollusks, beavers, seals, ducks, swans, crabs, etc. Apart from these aquatic animals, one genus of the family Anablepidae called A. anableps has a distinct optical structure comprised of traits from both aquatic and terrestrial animals. They are commonly known as the four-eyed fish, which can see through both aerial and aquatic environments at the same time. For many years, scientists discovered that the animal kingdom have an incredible diversity of vision. “For example, the bee’s eye produces neural image very similar to that of the human eye but with much worse resolution.” (Nilsson, 1989, p. 298). In addition, Nilsson (1989) shows that the bee’s eyes also detect “polarization of light in the sky and provides color information” (p. 298). Nilsson’s (1989) stated that the primary purpose of an image-forming apparatus in the eye is to provide the nervous system with information about the light intensity at
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