Eye
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An eye is a sensory organ that allows an organism to perceive visual information. It detects light and converts it into electro-chemical impulses in neurons. It is part of an organism's visual system.
Compound eye of an Antarctic krill
Eye of a European bison
Human eye
The eyes of a mantis shrimp (here Odontodactylus scyllarus) are considered the most complex in the animal kingdom.
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
Eye
…a narrow field of view, augmented by an array of smaller eyes for peripheral vision. Some insect larvae, like caterpillars, have a type of simple eye (stemmata) which usually provides only a rough image, but (as in sawfly larvae) can possess resolving powers of 4 degrees of arc, be polarization-sensitive, and…
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