Insects which turn and look
Date
1977
Authors
Horridge, George Adrian
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Abstract
The compound eyes of insects and crustaceans are not uniform: regions which look in different directions
become specialized for different functions. Some regions have larger facets and smaller angles between
adjacent visual axes. Larger facets allow greater resolution for individual ommatidia of the eye; smaller
angles between their axes allow a greater density of sampling stations. Many insects have one or
more foveas, together with specialized visual habits, but even without a fovea, turning to look is probably
a basic part of insect behaviour. Accurate alignment of the head axis then allows the estimation of
distance without necessity for stereopsis. The form of the eye in many insects strongly suggests that
they measure range over long distances by parallax rather than by binocular overlap.
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compound eye, insect, crustacean
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2037-12-31
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