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Trilobite eyes and the optics of Des Cartes and Huygens


The thick lenses in the aggregate eyes of a group oftrilobites were doublet structures designed to eliminate spherical aberration. The shape of the optically correcting interface is in accord with constructions by Des Cartes and Huygens and is dictated by a fundamental law of physics. Trilobites may have evolved such sophisticated eye-lenses to maximise optic neurone response in a dimly lit environment.

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  1. 1

    Clarkson, E. N. K., Palaeontology, 16, 425–444 (1973).

  2. 2

    Clarkson, E. N. K., Palaeontology, 9, 1–29 (1966).

  3. 3

    Clarkson, E. N. K., Senckenberg. leth., 49, 383–393 (1968).

  4. 4

    Towe, K. M., Science, 179, 1007–1009 (1973).

  5. 5

    Roy, S. K., Fieldiana: Geology, 6, 67–82 (1933).

  6. 6

    Clarkson, E. N. K., Trans. R. Soc. Edinb., 68, 183–205 (1969).

  7. 7

    Des Cartes, R., Oeuvres de Des Cartes. La Géometrie, Livre 2 (J. Maire, Leyden, 1637).

  8. 8

    Huygens, C., Traité de la Lumière (Pierre van der Aa, Leyden, 1690).

  9. 9

    Lockwood, E. H., A Book of Curves, 187–190 (Cambridge University Press, London, 1961).

  10. 10

    Dalingwater, J. E., Palaeontology, 16, 827–839 (1973).

  11. 11

    Levi-Setti, R., Park, D., and Winston, R., Nature, 253, 115 (1975).

  12. 12

    Urey, H. C., Lowenstam, H. A., Epstein, S., and McKinney, L. R., Bull. Geol. Soc. Am., 62, 399–416 (1951).

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