Image formation by bifocal lenses in a trilobite eye?

  title={Image formation by bifocal lenses in a trilobite eye?},
  author={J{\'o}zsef G{\'a}l and G{\'a}bor Horv{\'a}th and Euan N. K. Clarkson and Ott{\'o} Haiman},
  journal={Vision Research},
In this work we report on a unique and ancient type of eye, in which the lower surface of the upper calcite lens units possessed an enigmatic central bulge making the dioptric apparatus similar to a bifocal lens. This eye belonged to the trilobite Dalmanitina socialis, which became extinct several hundred million years ago. As far as we know, image formation by bifocal lenses of this kind did/does not occur in any other ancient or modern animal visual system. We suggest that the function of… CONTINUE READING

From This Paper

Figures, tables, and topics from this paper.


Publications citing this paper.
Showing 1-10 of 13 extracted citations


Publications referenced by this paper.
Showing 1-10 of 41 references

Oeuvres de DesCartes

  • R. DesCartes
  • La Géometrie. Livre 2. pp. 134. J. Maire, Leyden.
  • 1637
Highly Influential
4 Excerpts

Reconstruction of the shape and optics of the lenses in the abathochroal-eyed trilobite Neocobboldia chinlinica

  • J. Gál, G. Horváth, E.N.K. Clarkson
  • Historical Biology (submitted)
  • 2000
Highly Influential
4 Excerpts

Optics and vision in invertebrates

  • M. F. Land
  • H. Autrum, Comparati6e physiology and e6olution…
  • 1981
Highly Influential
6 Excerpts

The ecology of 6ision

  • J. N. Lythgoe
  • Oxford: Clarendon Press.
  • 1979
Highly Influential
3 Excerpts

Survey of modern counterparts of schizochroal trilobite eyes: structural and functional similarities and differences

  • G. 343–373. Horváth, E.N.K. Clarkson, W. Pix
  • Historical Biology,
  • 1997
Highly Influential
3 Excerpts

The lower lens unit in schizochroal trilobite eyes reduces reflectivity: on the possible optical function of the intralensar bowl

  • G. Horváth
  • Historical Biology,
  • 1996
Highly Influential
2 Excerpts

Trilobites (2nd edn)

  • R. Levi-Setti
  • Chicago: The University of Chicago Press.
  • 1993
Highly Influential
9 Excerpts

Trilobites: a photographic atlas

  • R. Levi-Setti
  • Chicago: The University of Chicago Press.
  • 1975
Highly Influential
12 Excerpts

Structure of the eye of Crozonaspis stru6ei (Trilobita, Dalmanitidae Zeliszkellinae

  • E.N.K. Clarkson
  • Senckenbergiana Lethaea, 49, 383–391.
  • 1968
Highly Influential
4 Excerpts

Similar Papers

Loading similar papers…