Simple eye in invertebrates

Simple Eye In Invertebrates

Simple eye in invertebrates

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A simple eye (sometimes called a pigment pit) refers to a type of eye design or optical arrangement that contains a single lens. "Simple" in this case does not refer to the number of cells present in the eye or the visual acuity of the eye. Indeed, the optical properties and anatomy of simple eyes is often incredibly complex. Human eyes and camera lenses are classed as "simple", because in both cases a single lens collects and focuses light onto the retina (eye), film (analog cameras), or Image sensor (digital cameras). This is most easily contrasted with the compound eye of insects, where each eye consists of multiple lenses (up to tens of thousands), each focusing light onto a small number of retinula cells.

The structure of an animal's eye is determined by the environment in which it lives, and the behavioural tasks the animal must fulfill in order to survive. Arthropods differ widely in the habitats in which they live, as well as their visual requirements for finding food or conspecifics, and avoiding predators. Consequently, an enormous variety of eye designs are found in arthropods: nature has repeatedly developed novel solutions to overcome visual problems or limitations (for a review of arthropod visual systems see Warrant, 2006).<ref...
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