A Devonian Trilobite with an Eyeshade

@article{Fortey2003ADT,
  title={A Devonian Trilobite with an Eyeshade},
  author={Richard A. Fortey and Brian D. E. Chatterton},
  journal={Science},
  year={2003},
  volume={301},
  pages={1689 - 1689}
}
Trilobites include the oldest species with preserved eyes for which detailed optical mechanisms have been suggested. They appear in the Cambrian, and in comparison to other species present then, trilobites already had unusually sophisticated eyes with lenses made out of the mineral calcite ( [1][1 
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The corneal lenses preserved in the eyes of some of the Paleozoic trilobites (Arthropoda) are constructed of calcite that is crystallographically oriented to behave like glass. The calcareous lenses
Independent testing of a paleobiological hypothesis; the optical design of two Ordovician pelagic trilobites reveals their relative paleobathymetry
-Evidence that can be used to interpret the life habits of extinct organisms usually takes three forms: functional analysis, analogy with living organisms, and geological evidence. Independent
Squint and the development of binocularity in humans
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It is shown that binocularity1, orientation sensitivity2,3, ocular dominance4 and disparity5 of cortical neurones can be modified by experimental procedures in kittens during the sensitive period (3–14 weeks of age).