A small eye of an insect or other arthropod that has only one lens, typically present in one or more pairs. Also called ocellus. Contrasted with compound eye.
- Complementing the large compound eyes, locusts have three much smaller simple eyes or ocelli characterized by rapid signal transmission and high photic sensitivity but very poor spatial resolution.
- Between the compound eyes are usually three simple eye, or ocelli.
- Humans, indeed all seeing vertebrates, have so-called simple eyes: they have a single lens system, focusing light to form one, continuous image of the outside world.
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Syllabification: sim·ple eye
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