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The optics of the growing lungfish eye: Lens shape, focal ratio and pupillary movements in Neoceratodus forsteri (Krefft, 1870)

Published online by Cambridge University Press:  06 September 2007

HELENA J. BAILES ,
ANN E.O. TREZISE  and
SHAUN P. COLLIN
HELENA J. BAILES
Affiliation:
School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
ANN E.O. TREZISE
Affiliation:
School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
SHAUN P. COLLIN
Affiliation:
School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
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Abstract

Lungfish (order Dipnoi) evolved during the Devonian period and are believed to be the closest living relatives to the land vertebrates. Here we describe the previously unknown morphology of the lungfish eye in order to examine ocular adaptations present in early sarcopterygian fish. Unlike many teleosts, the Australian lungfish Neoceratodus forsteri possesses a mobile pupil with a slow pupillary response similar to amphibians. The structure of the eye changes from juvenile to adult, with both eye and lens becoming more elliptical in shape with growth. This change in structure results in a decrease in focal ratio (the distance from lens center to the retina divided by the lens radius) and increased retinal illumination in adult fish. Despite a degree of lenticular correction for spherical aberration, there is considerable variation across the lens. A re-calculation of spatial resolving power using measured focal ratios from cryosectioning reveals a low ability to discriminate fine detail. The dipnoan eye shares more features with amphibian eyes than with most teleost eyes, which may echo the visual needs of this living fossil.

Keywords

DipnoiOpticsDevelopmentLongitudinal spherical aberration of the lensMatthiessen's ratio
Type
Research Article
Information
Visual Neuroscience , Volume 24 , Issue 3 , May 2007 , pp. 377 - 387
Copyright
© 2007 Cambridge University Press

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