Cronin, Thomas W. Department of Biological Sciences, University of Maryland, Baltimore, Maryland.
Barnes, Robert D. Department of Biology, Gettysburg College, Gettysburg, Pennsylvania.
- Structure and occurrence
- Compound eyes
- Nocturnal vision
- Polarization vision
- Links to Primary Literature
- Additional Readings
An aggregation of photoreceptor cells together with any associated optical structures in invertebrate organisms. Eyes occur almost universally among animals and are possessed by some species of virtually every major animal phylum. However, the complexity of eyes varies greatly, and this sense organ undoubtedly evolved independently a number of times within the animal kingdom. See also: Sense organ
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