Basic mechanisms in pinniped vision
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Abstract
Pinnipeds are amphibious mammals. The amphibious lifestyle is challenging for all sensory systems including vision, and specific adaptations of the eyes have evolved in response to the changed requirements concerning vision in two optically very different media, water and air. The present review summarizes the information available on pinniped eyes with an emphasis on harbour seal vision for which most information is available to date. Recent studies in this species have improved the understanding of amphibious vision by reanalysing refraction, by studying corneal topography, and by measuring visual acuity as a function of ambient luminance. The harbour seal eye can be characterized as an eye that balances high resolution, supported by data on ganglion cell density and topography, and sensitivity. Furthermore, it was shown that seals have multifocal lenses, broad visual fields, and distinct eye movement abilities. The mechanisms described here form the basis for future research on visually guided behaviour.
Keywords
Pinnipeds Visual system Amphibious vision Resolution SensitivityNotes
Acknowledgments
The authors would like to thank the numerous collaborators that accompanied and influenced their own work on harbour seal vision with new ideas, helpful comments, and advice as well as never-ending support of all kind. The authors’ research has been supported by grants of the Studienstiftung des deutschen Volkes to FDH, the Deutsche Forschungsgemeinschaft to WH and CS, and by grants of the VolkswagenStiftung and the Deutsche Forschungsgemeinschaft (SFB 509) to GD.
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