Simple eye in invertebrates

A simple eye or ocellus is a form of eye or an optical arrangement which has a single lens without the sort of elaborate retina that occurs in most vertebrates. These eyes are called "simple" to distinguish them from "compound eyes", which have multiple lenses; they are not necessarily simple in the sense of being uncomplicated or basic.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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