Animal Vision: Ocelli, Compound Eyes, and Camera Eyes
Did you know that there are many different kinds of eyes? And that not all of them even see images? Different creatures need different kinds of eyes to help them survive in their environment. For example, chameleon's eyes move independently of one another so that they can see two different directions at once. That way, one eye can be searching for food while the other one is watching out for predators.
A simple eye is an eye that relies on one lens to see. A lens is the part of the eye that catches and focuses light in order to create an image. Humans and large animals have a single lens eye structure most commonly referred to as a camera eye. Much like a camera, our eyes use a single lens to focus light on the retina in order to create an image in the brain. The retina is a layer of tissue where the image that passes through cornea (the eye's window) and lens gets sent to the brain.
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