Evolution of the Eye and the Different Parts

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In 1802, philosopher William Paley called the eye a miracle of "design". Your eyes are responsible for 80 percent of all of the information that your brain receives. (Schleifer, 2014) But how did our eyes form? How are we able to see what we see? What allows us to see the colors we see? The eye is made up of many different complex parts that all work together to create images our brain can understand. The eye is made up of the front parts, or parts we can see, the interior parts, or parts we can’t see, the nerves which carry signals to our brain, and glands that protect our eyes. The eyes we have today have evolved over a long period of time and undergone many different changes, according to Charles Darwin, Richard Dawkins, and many other evolutionists. When all of the different parts of our eyes work together we are able to see a clear image that is produced from our brain.
How did our eyes form? In 1859, Charles Darwin wrote a book called the Origin of Species (a book that states Darwin’s theory of evolution by natural selection). In the book, Darwin stated that it seemed absurd to think that the eye formed by natural selection. He was baffled by the complexity of the eye and how it formed. But, Darwin still believed the eye did form by natural selection although there was no evidence to support his claim.(Lamb, 2014) Since eyes do not fossilize very well, it is hard for scientists to follow the development of the eye. In Darwin’s book, he wrote of stages that he believed the eyes might have undergone over time to evolve into the eyes we have today. Eyes range in complexity and in the type of organisms they appear in, from simple unicellular organisms with simple eyes, to multicellular organisms with extremely complex eyes. Eve...

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... moist and are in the outer corner of each eye. Blinking evenly spreads the tears produced by your tear glands over the eyes. Tears keep the eyes from drying out as well as help wash away germs, dust, and other particles that don’t belong in your eyes.
How do human eyes differ from other organisms or other primates eyes? As animals evolved overtime with more complex bodies, the eye also evolved and became more complex. There are several differences that help the human eye stand out. In other primates’ eyes, a pigment is present that covers the sclera. Humans do not posses this pigment and that is why our eyeball is white. Humans eyes are also set closer together than many other animals. This gives humans depth perception, but lessens our ability to have good peripheral vision. Humans eye are also elongated horizontally, compared to other primates eyes. (Than, 2006)

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