Simple eye in invertebrates
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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 disti
Head of Polistes with two compound eyes and three ocelli (circled)
This jumping spider's main ocelli (center pair) are very acute. The outer pair are "secondary eyes" and other pairs of secondary eyes are on the sides and top of its head.
Head of a wasp with three dorsal ocelli (centre), and the upper part of its compound eyes (left and right)
Moth larva about to moult; the new stemmata are visible behind the old head capsule
Compound eye
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A compound eye is a visual organ found in arthropods such as insects and crustaceans. It may consist of thousands of ommatidia, which are tiny independent photoreception units that consist of a cornea
Simple eye in invertebrates
…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. The structure of an animal's eye is determined…
Compound eye of Antarctic krill as imaged by an electron microscope
Head of a mantisfly showing a compound eye
Compound eye of a dragonfly
Astronotus ocellatus closeup